EP0242227B1 - Elastomeric neutron protection material - Google Patents
Elastomeric neutron protection material Download PDFInfo
- Publication number
- EP0242227B1 EP0242227B1 EP87303420A EP87303420A EP0242227B1 EP 0242227 B1 EP0242227 B1 EP 0242227B1 EP 87303420 A EP87303420 A EP 87303420A EP 87303420 A EP87303420 A EP 87303420A EP 0242227 B1 EP0242227 B1 EP 0242227B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- protection material
- protection
- elastomeric
- absorber
- hydrogen content
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 title claims description 46
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 16
- 239000001257 hydrogen Substances 0.000 claims description 16
- 229910052739 hydrogen Inorganic materials 0.000 claims description 16
- 239000006096 absorbing agent Substances 0.000 claims description 9
- 239000007795 chemical reaction product Substances 0.000 claims description 6
- 229920005862 polyol Polymers 0.000 claims description 6
- 150000003077 polyols Chemical class 0.000 claims description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 5
- 229910052796 boron Inorganic materials 0.000 claims description 5
- 239000003431 cross linking reagent Substances 0.000 claims description 5
- 239000005062 Polybutadiene Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000012948 isocyanate Substances 0.000 claims description 3
- 229920002857 polybutadiene Polymers 0.000 claims description 3
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 2
- 150000002513 isocyanates Chemical class 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- NHIRIMBKJDSLBY-UHFFFAOYSA-N 3-[bis(3-hydroxypropyl)amino]propan-1-ol Chemical compound OCCCN(CCCO)CCCO NHIRIMBKJDSLBY-UHFFFAOYSA-N 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 claims 1
- 239000000047 product Substances 0.000 claims 1
- 229960004418 trolamine Drugs 0.000 claims 1
- -1 polyethylene Polymers 0.000 description 9
- 239000000126 substance Substances 0.000 description 8
- 239000004698 Polyethylene Substances 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 229910052580 B4C Inorganic materials 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- CKPKHTKLLYPGFM-UHFFFAOYSA-N 6,6-dimethylheptane-1,1-diol Chemical compound CC(CCCCC(O)O)(C)C CKPKHTKLLYPGFM-UHFFFAOYSA-N 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 150000001639 boron compounds Chemical class 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- AYOHIQLKSOJJQH-UHFFFAOYSA-N dibutyltin Chemical compound CCCC[Sn]CCCC AYOHIQLKSOJJQH-UHFFFAOYSA-N 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000005865 ionizing radiation Effects 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F1/00—Shielding characterised by the composition of the materials
- G21F1/02—Selection of uniform shielding materials
- G21F1/10—Organic substances; Dispersions in organic carriers
Definitions
- the invention relates to an elastomeric neutron protection material for decelerating fast neutrons, comprising an elastomeric material having a high hydrogen content and being preferably combined with an absorber material, e.g., boron, for decelerating slow electrons.
- an absorber material e.g., boron
- Known elastomeric neutron protection materials of the kind indicated are silicone elastomer-based (German disclosure Letter 28 22 494) or polyurethane-based (German disclosure Letter 32 38 831) and offer important advantages over polyethylene and polypropylene, or even simpler protection materials like water, paraffin and the like, with respect to mechanical and chemical properties, particularly temperature resistivity, toughness, resilient deformability, workability, and chemical durability.
- the hydrogen content which is the determining factor for the neutron decelerating capability, however, is considerably less than in polyethylene and polypropylene (14.3 weight percent), polyamide (11.6 weight percent) or water (11.1 weight percent), and amounts to about a maximum of 5 to 7 weight percent.
- Further consideration of other known neutron protection materials (German disclosure Letter 32 38 831) shows that protection materials were not available which combine in themselves good mechanical and chemical properties with a high hydrogen content similar to that of polyethylene.
- a material which comprises a polymeric reaction product of a reaction between a) at least one polybutadiene-based polyol and b) at least one aliphatic diisocyanate, the reaction product having a hydrogen content of at least 8 weight percent, said protection material having a total hydrogen content of from 10 to 12.5 weight percent.
- This composition thus provides an elastomeric neutron protection material which exhibits good mechanical, chemical, and physical properties, particularly easy workability, chemical durability, and temperature resistivity, with a particularly high hydrogen content.
- Elastomeric neutron protection materials in accordance with the invention can be simply prepared like known polyurethanes and have, similar to the latter, very favorable mechanical, chemical and physical properties; the hydrogen content, however, is considerably higher 10 to 12.5 weight percent, which is up to double the hydrogen content of known neutron protection materials having comparable elastomeric properties. In any case, a hydrogen content of more than 8 weight percent is desired and readily obtainable.
- the neutron protection materials according to the invention can be easily combined with absorber materials, particularly boron or boron-containing substances for absorbing slow neutrons.
- absorber materials particularly boron or boron-containing substances for absorbing slow neutrons.
- an absorber material such as boron carbide or boron nitride
- the absorber material can also be provided in chemically bonded form; for instance, the polyols can be partly or totally provided in the form of organic boron compounds, e.g., diol boric acid ester.
- neutron protection material according to the invention can also be combined with other radiation protection materials, for example with heavy metals or heavy metal compounds, for example in finely divided form as filler material, in order to achieve an additional protection against ionizing radiation.
- the preparation of the neutron protection materials in accordance with the invention basically may be performed in the same manner as the preparation of known polyurethanes, and with the use of corresponding catalysts. If the two components are brought to reaction, the OH radicals of the polyol react with the NCO radicals of the isocyanate.
- the favorable properties of the neutron protection materials according to the invention are based essentially due on the fact that polybutadiene-based polyol have a hydrogen content similar to that of polyethylene and result in reaction products which have a high elasticity and a high durability against shock loads.
- the aliphatic diisocyanates used in accordance with the invention have higher hydrogen contents than the usually employed aromatic diisocyanates and result in reaction products having a high temperature resistivity.
- particularly trifunctional crosslinking agents can be employed which offer advantages because of their high reactivity; such crosslinking agents are not applicable with aromatic isocyanates.
- Particularly well suited are crosslinking agents from the group nitrolo tripropanol, triethanolamine and nitrotributanol.
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Polyurethanes Or Polyureas (AREA)
Description
- The invention relates to an elastomeric neutron protection material for decelerating fast neutrons, comprising an elastomeric material having a high hydrogen content and being preferably combined with an absorber material, e.g., boron, for decelerating slow electrons.
- Known elastomeric neutron protection materials of the kind indicated are silicone elastomer-based (German disclosure Letter 28 22 494) or polyurethane-based (German disclosure Letter 32 38 831) and offer important advantages over polyethylene and polypropylene, or even simpler protection materials like water, paraffin and the like, with respect to mechanical and chemical properties, particularly temperature resistivity, toughness, resilient deformability, workability, and chemical durability. The hydrogen content, which is the determining factor for the neutron decelerating capability, however, is considerably less than in polyethylene and polypropylene (14.3 weight percent), polyamide (11.6 weight percent) or water (11.1 weight percent), and amounts to about a maximum of 5 to 7 weight percent. Further consideration of other known neutron protection materials (German disclosure Letter 32 38 831) shows that protection materials were not available which combine in themselves good mechanical and chemical properties with a high hydrogen content similar to that of polyethylene.
- In accordance with the invention, there is provided a material which comprises a polymeric reaction product of a reaction between a) at least one polybutadiene-based polyol and b) at least one aliphatic diisocyanate, the reaction product having a hydrogen content of at least 8 weight percent, said protection material having a total hydrogen content of from 10 to 12.5 weight percent.
- This composition thus provides an elastomeric neutron protection material which exhibits good mechanical, chemical, and physical properties, particularly easy workability, chemical durability, and temperature resistivity, with a particularly high hydrogen content.
- Elastomeric neutron protection materials in accordance with the invention can be simply prepared like known polyurethanes and have, similar to the latter, very favorable mechanical, chemical and physical properties; the hydrogen content, however, is considerably higher
10 to 12.5 weight percent, which is up to double the hydrogen content of known neutron protection materials having comparable elastomeric properties. In any case, a hydrogen content of more than 8 weight percent is desired and readily obtainable. - Of the mechanical properties, the following should be particularly emphasized:
- flexibility at low temperatures (glass transition temperature about -60°C;
- low shrinkage rate;
- low vapor permeability;
- castable; possibility to manufacture structural parts of high volume; filler materials, particularly of an abrasive nature, e.g., boron carbide powder, can be simple intermixed;
- interlinked, thus not exhibiting cold flow;
- good adhesion and cohesion; better compatibility with usual layered systems, for instance if further layers or a protection lacquer is applied.
- Of the chemical properties, the following should be particularly emphasized;
- good durability against hydrolysis;
- good durability against alkali and acids;
- good durability of coloration against light;
- good durability against oxygen;
- sprayable (even with a high content of filler materials).
- The neutron protection materials according to the invention can be easily combined with absorber materials, particularly boron or boron-containing substances for absorbing slow neutrons. For instance, an absorber material, such as boron carbide or boron nitride, can be provided as a filler material in finely divided form. Then, the neutron protection material will form a shield against slow as well as against fast neutrons. The absorber material can also be provided in chemically bonded form; for instance, the polyols can be partly or totally provided in the form of organic boron compounds, e.g., diol boric acid ester.
- It should be understood that the neutron protection material according to the invention can also be combined with other radiation protection materials, for example with heavy metals or heavy metal compounds, for example in finely divided form as filler material, in order to achieve an additional protection against ionizing radiation.
- The preparation of the neutron protection materials in accordance with the invention basically may be performed in the same manner as the preparation of known polyurethanes, and with the use of corresponding catalysts. If the two components are brought to reaction, the OH radicals of the polyol react with the NCO radicals of the isocyanate.
- The favorable properties of the neutron protection materials according to the invention are based essentially due on the fact that polybutadiene-based polyol have a hydrogen content similar to that of polyethylene and result in reaction products which have a high elasticity and a high durability against shock loads. The aliphatic diisocyanates used in accordance with the invention have higher hydrogen contents than the usually employed aromatic diisocyanates and result in reaction products having a high temperature resistivity. For crosslinking, particularly trifunctional crosslinking agents can be employed which offer advantages because of their high reactivity; such crosslinking agents are not applicable with aromatic isocyanates. Particularly well suited are crosslinking agents from the group nitrolo tripropanol, triethanolamine and nitrotributanol.
- It should be understood that all batch components used in the preparation of the neutron protection material according to the invention are selected with a view to obtaining as high a hydrogen content as possible. Batch components which contain hydrogen only in small amounts, or not at all, should be used in amounts as small as possible in order to avoid unnecessary reduction of the hydrogen content of the final product.
- The invention will be subsequently described by means of embodiment examples. In the tables, all contents are shown, in both weight percents and in parts by weight (parts by weight are in parenthesis).
Table 2 With Absorber Material Example No. Batch Components 5 Parts by Weight Weight Percent Shellsol T (Shell) (8.800) 8.38 Bentone 34 (0.800) 0.76 Ethanol (0.400) 0.38 B₄C Powder (71.650) 68.25 Zeolith-L-Paste (3.100) 2.95 Poly BD R45 NT (12.100) 11.52 Trimethyl hexane diol (3.000) 2.86 Irganox 1076 (0.120) 0.11 Dibutyl tin dilaureate (10%) (0.030) 0.03 Isophoron diisocyanate (5) 4.76 (105.00) 100.00 Mechanical Properties Adhesion to steel (MPa) 8.3 8.3
Claims (11)
- An elastomeric neutron protection material capable of decelerating fast neutrons, comprising an elastomeric polymeric reaction product of a reaction between:a) at least one polybutadiene-based polyol; andb) at least one aliphatic diisocyanate; the product having a hydrogen content of at least 8 weight percent, said protection material having a total hydrogen content of from 10 to 12.5 weight percent.
- The protection material according to claim 1 wherein said material has a tensile strength of from 11 to 12.5 N/mm².
- The protection material according to any preceding claim wherein said material has an elongation at break of from 100 to 800%.
- The protection material according to any preceding claim wherein said material has a tear strength of from 3 to 7 N/mm².
- The protection material according to any preceding claim wherein said material has a Shore A hardness of from 60 to 90.
- The protection material according to any preceding claim further including an absorber material capable of decelerating slow neutrons.
- The protection material of claim 6 wherein said absorber material comprises boron.
- The protection material of any preceding claim further containing an absorption layer comprising an absorber material capable of decelerating slow neutrons.
- The protection material of claim 8 wherein said absorber material comprises boron.
- A process for preparing the protection material according to any preceding claim comprising reacting said polyol and said isocyanate in the presence of a crosslinking agent to form a polymeric reaction product.
- The process according to claim 10 wherein said crosslinking agent is trifunctional and selected from the group consisting of nitrilo tripropanol, triethanol amine, and nitro tributanol.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3612971A DE3612971C2 (en) | 1986-04-17 | 1986-04-17 | Process for the preparation of an elastomeric neutron protection material |
| DE3612971 | 1986-04-17 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0242227A2 EP0242227A2 (en) | 1987-10-21 |
| EP0242227A3 EP0242227A3 (en) | 1988-10-05 |
| EP0242227B1 true EP0242227B1 (en) | 1993-02-10 |
Family
ID=6298902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87303420A Expired - Lifetime EP0242227B1 (en) | 1986-04-17 | 1987-04-16 | Elastomeric neutron protection material |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0242227B1 (en) |
| JP (1) | JPS6324197A (en) |
| DE (1) | DE3612971C2 (en) |
| IL (1) | IL82227A0 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4938233A (en) * | 1987-08-03 | 1990-07-03 | Techton, Inc. | Radiation shield |
| DE4131274C2 (en) * | 1991-09-20 | 1995-05-11 | Braas Gmbh | Neutron absorbing plastic sheet |
| US6373066B1 (en) * | 1999-08-20 | 2002-04-16 | Saint-Gobain Industrial Ceramics, Inc. | Thermal neutron detector using a scintillator with background gamma ray shielding |
| DE102005057428B3 (en) * | 2005-11-30 | 2007-08-16 | Krebs Beschichtungssysteme Gmbh | Radiation resisting and -shielding coating system for components and structures, comprises carrier- and covering layers formed by sprayable gum out of isocyanate hardening polymer and composition of gum particles |
| FR2961940B1 (en) * | 2010-06-28 | 2016-07-29 | Constructions Ind De La Mediterranee Cnim | NEUTRON SHIELDING MATERIAL, DEVICE FOR STORING AND TRANSPORTING RADIOACTIVE PRODUCTS, AND METHOD FOR MANUFACTURING THE SAME |
| BR112017007702A2 (en) * | 2014-10-16 | 2017-12-19 | Univ Kingston | composition, coating composition and method |
| CN112759735A (en) * | 2021-01-15 | 2021-05-07 | 中国工程物理研究院材料研究所 | Polyurethane-based hydrogen-absorbing material and preparation method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4187215A (en) * | 1972-09-25 | 1980-02-05 | Aerojet-General Corporation | Polymeric isocyanate-hydroxy terminated polybutadiene compositions |
| JPS5232996A (en) * | 1975-09-09 | 1977-03-12 | Bridgestone Corp | Process for preparing polyurethanes based on polydienes |
| US4072702A (en) * | 1976-12-06 | 1978-02-07 | The United States Of America As Represented By The Secretary Of The Army | Tri-functional isocyanate crosslinking agents for hydroxy-terminated polybutadiene binders |
| DE3018548A1 (en) * | 1980-05-14 | 1981-11-19 | Wacker-Chemie GmbH, 8000 München | CROSSLINKABLE MASSES TO ELASTIC RADIATION PROTECTION MATERIALS AND ELASTOMERS FROM SUCH MASSAGES |
| FR2534058B1 (en) * | 1982-10-04 | 1988-10-07 | Guibert Jacques | PROJECTIONABLE ANTINEUTRONIC COATING |
| DE3238831A1 (en) * | 1982-10-20 | 1984-04-26 | Walter Ing.(grad.) 6990 Bad Mergentheim Ries | Neutron-shielding material and neutron-shielding devices made from such material |
-
1986
- 1986-04-17 DE DE3612971A patent/DE3612971C2/en not_active Expired - Fee Related
-
1987
- 1987-04-16 IL IL82227A patent/IL82227A0/en not_active IP Right Cessation
- 1987-04-16 EP EP87303420A patent/EP0242227B1/en not_active Expired - Lifetime
- 1987-04-17 JP JP62095004A patent/JPS6324197A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6324197A (en) | 1988-02-01 |
| IL82227A0 (en) | 1987-10-30 |
| EP0242227A3 (en) | 1988-10-05 |
| DE3612971C2 (en) | 1997-09-18 |
| EP0242227A2 (en) | 1987-10-21 |
| DE3612971A1 (en) | 1987-12-23 |
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