Patent US4769417A successfully refreshed from Google Patents.
US4769417A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New rubber polymers with block-like structure
Assignee: Bayer AG
•
Filing: 1987-05-12
•
Granted: 1988-09-06
•
Expires: 2007-05-12
Abstract
Abstract The invention relates to new block copolymers consisting of recurring polysiloxane blocks and recurring conjugated diene homo-or copolymer blocks with particularly good rubber properties, in particular at low temperatures.
Inventors
- 👤 Herbert Eichenauer
- 👤 Christian Lindner
- 👤 Karl-Heinz Ott
- 👤 Hartwig Hocker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:55
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/42
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
131 words
A rubber polymer with a block structure comprising recurring structural units of the general formula --A-B].sub.n (I) wherein A represents polysiloxane segments of the formula --(R.sup.1) (R.sup.2)SiO].sub.x (III) in which R 1 and R 2 denote aryl radicals, alkyl radicals or combinations thereof, n is an integer from 2 to 500, x represents a number such that segments (III) have a weight average molecular weight, M w , of greater than 500 to 20,000; B represents homo- or copolymer segments having weight average molecular weights, M w , of 800 to 12,000, derived from conjugated diene monomers, and wherein the rubber polymer has a weight average molecular weight, M w , of 10,000 to 1,000,000 and the glass transition temperatures of the polymer blocks A and B are below 0° C.
Claim 2
Dependent Claim
131 words
A rubber polymer with a block structure comprising recurring structural units of the general formula --A-B].sub.n (I) wherein A represents polysiloxane segments of the formula --(R.sup.1) (R.sup.2)SiO].sub.x (III) in which R 1 and R 2 denote aryl radicals, alkyl radicals or combinations thereof, n is an integer from 2 to 500, x represents a number such that segments (III) have a weight average molecular weight, M w , of greater than 500 to 20,000; B represents homo- or copolymer segments having weight average molecular weights, M w , of 800 to 12,000, derived from conjugated diene monomers, and wherein the rubber polymer has a weight average molecular weight, M w , of 10,000 to 1,000,000 and the glass transition temperatures of the polymer blocks A and B are below 0° C.
Claim 3
Dependent Claim
57 words
A rubber polymer according to claim 1 additionally comprising recurring structural units of the general formula --A'-C].sub.m in which m is an integer of from 1 to 500, A' is defined as A above and C represents bifunctional aliphatic polyester or aliphatic polyether segments with a weight average molecular weight, M w , of 800 to 12,000.
Claim 4
Dependent Claim
25 words
A rubber polymer according to claim 1 in which the rubber polymer has a weight average molecular weight, M w , of 10,000 to 50,000.
Claim 5
Dependent Claim
25 words
A rubber polymer according to claim 2 in which the rubber polymer has a weight average molecular weight, M w , of 10,000 to 50,000.
Claim 6
Dependent Claim
68 words
A rubber polymer according to claim 1, in which the segment B represents a homopolymer segment derived from butadiene monomer or a copolymer segment derived from butadiene monomer and from 5 to 35% by weight based on B, of copolymerized monomers selected from acrylonitrile, methacrylonitrile, styrene, halostyrene, p-methylstyrene, or esters derived from (i) methacrylic acid or acrylic acid and (ii) an alcohol containing 1 to 12 carbon atoms.
Claim 7
Dependent Claim
45 words
A rubber polymer according to claim 2 in which the segment C contains C 1 to C 6 alkylene units of bifunctional polyester radicals selected from polycondensates of aliphatic C 2 to C 12 dicarboxylic acids and aliphatic C 2 to C 18 alkylene diols.
Claim 8
Dependent Claim
130 words
A process for the production of a rubber polymer according to claim 1, in which a homo- or copolymer of conjugated dienes with terminal hydroxyl groups of the general formula HO--B--OH (IV) in which B has the same meaning as in claim 1, and also a polysiloxane of the general formula R.sup.3 COO--(R.sup.1)(R.sup.2)SiO]COR.sup.3 (VI) in which R 1 and R 2 have the same meanings as in claim 1 and R 3 denotes a C 1 to C 18 alkyl radical, are polycondensed with elimination of R 3 COOH acid, and in which the compound of formula (IV) has a weight average molecular weight, M w , of 800 to 12,000 and the compound of formula (VI) has a weight average molecular weight, M w , of 500 to 20,000.
Claim 9
Dependent Claim
57 words
A process according to claim 7, in which the polycondensation of (IV) and (VI) further comprises polycondensing an aliphatic polyester, polyether diol or combination thereof of the formula HO--C--OH (V) in which C represents segments derived from an aliphatic polyester, polyether or mixture thereof with a weight average molecular weight, M w , of 800 to 12,000.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |