US3970715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic polyurethanes mixed with ethylene copolymers
Assignee: Imperial Chemical Industries Ltd
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Filing: 1974-06-21
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Granted: 1976-07-20
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Expires: 1994-06-21
Abstract
Abstract Compositions comprising soluble and/or thermoplastic polyurethanes mixed with copolymers of ethylene and unsaturated esters of fatty acids show improved resistance to abrasion. Films made from the compositions show a reduced tendency to exhibit blocking. Use of ethylene copolymers mixed with additives also provides a useful way of mixing additives into polyurethanes.
Inventors
- 👤 Graham Jarrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:23
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
129 words
A process for the manufacture of a thermoplastic polyurethane elastomer composition having a reduced tendency to blocking compared with the thermoplastic polyurethane elastomer itself, which comprises forming a thermoplastic polyurethane elastomer of high tensile strength by reacting an organic diisocyanate with an aliphatic polymeric diol of molecular weight greater than 800 and a chain-extending agent which consists of a diol of molecular weight less than 250, the reactants being free from ethylenic unsaturation, and thereafter blending the thermoplastic polyurethane elastomer with from 1 to 5% by weight, based on the polyurethane, of an ethylene copolymer consisting of 98.3 to 79 molar % of ethylene copolymerized with from 1.7 to 21 mole % of an unsaturated ester of a fatty acid, said ester containing from 3 to 8 carbon atoms.
Claim 2
Dependent Claim
129 words
A process for the manufacture of a thermoplastic polyurethane elastomer composition having a reduced tendency to blocking compared with the thermoplastic polyurethane elastomer itself, which comprises forming a thermoplastic polyurethane elastomer of high tensile strength by reacting an organic diisocyanate with an aliphatic polymeric diol of molecular weight greater than 800 and a chain-extending agent which consists of a diol of molecular weight less than 250, the reactants being free from ethylenic unsaturation, and thereafter blending the thermoplastic polyurethane elastomer with from 1 to 5% by weight, based on the polyurethane, of an ethylene copolymer consisting of 98.3 to 79 molar % of ethylene copolymerized with from 1.7 to 21 mole % of an unsaturated ester of a fatty acid, said ester containing from 3 to 8 carbon atoms.
Claim 3
Dependent Claim
34 words
A process as claimed in claim 1 wherein the copolymer used is a copolymer consisting of 98.3 to 79 molar % of ethylene units and 1.7 to 21 molar % of vinyl acetate units.
Claim 4
Dependent Claim
21 words
A process as claimed in claim 1 which comprises blending together granules of the polyurethane and granules of the ethylene copolymer.
Claim 5
Dependent Claim
34 words
A process as claimed in claim 2 wherein the copolymer used is a copolymer consisting of 4.3 to 11.2 molar % of vinyl acetate units and 88.8 to 95.7 molar % of ethylene units.
Claim 6
Dependent Claim
30 words
A process as claimed in claim 4 wherein the copolymer used is a copolymer consisting of 6.8 molar % of vinyl acetate units and 93.2 molar % of ethylene units.
Claim 7
Dependent Claim
29 words
A process as claimed in claim 2 wherein the polyurethane used is obtained by reacting poly(ethylene adipate) of molecular weight 2000 with 4,4'-diphenylmethane diisocyanate and then chain-extending with 1,4-butanediol.
References Cited (Backward Citations)
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GB1091200A
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US3429948A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |