Patent US3758631A successfully refreshed from Google Patents.
US3758631A
Expired / Lapsed
US
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Polycaprolactam block polymers of polyesters
Assignee: Bridgestone Firestone Inc
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Filing: 1971-07-12
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Granted: 1973-09-11
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Expires: 1991-07-12
Abstract
Abstract Block copolymers of polycaprolactam and polylactone are produced by reacting, in the presence of an anionic catalyst, caprolactam with a polylactonediol which has been end-grouped, and optionally chain-extended, with a diisocyanate. The products are useful in elastic articles such as pneumatic tires, threads, etc., and as components of melt adhesives.
Inventors
- 👤 B Werner
- 👤 R Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:24
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08G18/00; C08G18/06; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
22 words
Process in accordance with claim 1 wherein the block copolymer is further reacted with a curing agent to produce a crOss-linked product.
Claim 2
Dependent Claim
13 words
Process according to claim 1, wherein the polylactone diol is poly(epsilon caprolactone) diol.
Claim 3
Dependent Claim
12 words
Process according to claim 2, wherein the curing agent is a diepoxide.
Claim 4
Dependent Claim
23 words
Process according to claim 1, wherein the diisocyanate is used in the amount of 1.20 to 1.40 mole per mole of polylactone diol.
Claim 5
Dependent Claim
36 words
Process according to claim 5, wherein the anionic catalyst is sodium metal and is employed in amount from 0.1 to 1.0 mole per mole-equivalent of diisocyanate group (-NCO) present in the diisocyanate used in the process.
Claim 6
Dependent Claim
15 words
A block copolymer according to claim 7, wherein the polylactone diol is poly(epsilon caprolactone) diol.
Claim 7
Dependent Claim
11 words
An elastic thread composed of the block copolymer of claim 7.
Claim 8
Dependent Claim
10 words
A hot-melt adhesive comprising the block copolymer of claim 7.
Claim 9
Dependent Claim
10 words
A block polymer produced by the process of claim 1.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |