US5003004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tough flexible polymer blends
Assignee: EIDP Inc
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Filing: 1988-10-25
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Granted: 1991-03-26
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Expires: 2008-10-25
Abstract
Abstract A blend of a softer continuous phase polymer reinforced with harder acrylic star polymer particles having reactive functional groups with crosslinking ability built in or provided by a third polymer. The harder polymer has a T g at least 10° C. above that of the softer polymer, and the acrylic star polymer is preferably made by group transfer polymerization. This blend provides coating compositions, films and bulk polymer with enhanced toughness and flexibility.
Inventors
- 👤 John A. Simms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:56
CPC Classifications
C; C08; C08L; C08L53/00; C08F; C08F293/00; C08F293/005; C09; C09D; C09D153/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31573; Y10T428/31576
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
229 words
A blend of at least two polymers, comprising about, by weight of blend solids, (A) 10-60% of at least one acrylic star polymer comprising a crosslinked core which comprise (i) a polymer derived from a mixture comprising (a) 1-100% by weight of one or more monomers, each having at least two groups, ##STR16## (b) 0-99% by weight of one or more monomers, each having one group ##STR17## (ii) attached to the core, at least 5 arms comprising polymer chains derived from one or more monomers, each having one group, ##STR18## in each of which R is the same or different and is H, CH 3 , CH 3 CH 2 , CN or CO 2 R' and Z' is O or NR', wherein R' is C 1-4 alkyl, wherein said arms contain reactive functional groups in an amount of at least about one such group per arm on the average, said star polymer having a primary glass transition temperature above 20° C.; (B) 15-60% of at least one matrix-forming polymer selected from polyester, polyether, polyurethanes, and polysiloxanes different than that of polymer (A) and having a primary glass transition temperature below 10° C., a number average molecular weight of at least about 500, and a functionality of at least 2; and (C) said blend having crosslinking capability, either in polymers (A) and (B), or in a third, crosslinking polymer.
Claim 2
Dependent Claim
229 words
A blend of at least two polymers, comprising about, by weight of blend solids, (A) 10-60% of at least one acrylic star polymer comprising a crosslinked core which comprise (i) a polymer derived from a mixture comprising (a) 1-100% by weight of one or more monomers, each having at least two groups, ##STR16## (b) 0-99% by weight of one or more monomers, each having one group ##STR17## (ii) attached to the core, at least 5 arms comprising polymer chains derived from one or more monomers, each having one group, ##STR18## in each of which R is the same or different and is H, CH 3 , CH 3 CH 2 , CN or CO 2 R' and Z' is O or NR', wherein R' is C 1-4 alkyl, wherein said arms contain reactive functional groups in an amount of at least about one such group per arm on the average, said star polymer having a primary glass transition temperature above 20° C.; (B) 15-60% of at least one matrix-forming polymer selected from polyester, polyether, polyurethanes, and polysiloxanes different than that of polymer (A) and having a primary glass transition temperature below 10° C., a number average molecular weight of at least about 500, and a functionality of at least 2; and (C) said blend having crosslinking capability, either in polymers (A) and (B), or in a third, crosslinking polymer.
Claim 3
Dependent Claim
36 words
The blend of claim 1 wherein the difference in primary glass transition temperature between polymers (A) and (B) is at least 45° C., and polymer (B) has a number average molecular weight less that about 3000.
Claim 4
Dependent Claim
26 words
The blend of claim 1 wherein the reactive functional groups of (A) comprise hydroxyl groups, with a hydroxyl number within the range of 8 to 120.
Claim 5
Dependent Claim
18 words
The blend of claim 3 wherein the hydroxyl groups are located randomly through the length of the arms.
Claim 6
Dependent Claim
34 words
An enamel paint wherein the vehicle comprises a polymer blend of claim 1 suspended or dissolved in suitable solvents, wherein (C) is 10-30% of a nitrogen-bearing crosslinking resin selected from polyisocyanate and melamine-formaldehyde resin.
Claim 7
Dependent Claim
9 words
A substrate coated with the enamel of claim 5.
Claim 8
Dependent Claim
14 words
The enamel of claim 5 wherein (C) is 10-30% of a nitrogen-bearing crosslinking resin.
Claim 9
Dependent Claim
12 words
The enamel of claim 7 wherein the crosslinking resin is a polyisocyanate.
Claim 10
Dependent Claim
13 words
The enamel of claim 7 wherein the crosslinking resin is a melamine-formaldehyde resin.
Claim 11
Dependent Claim
28 words
The enamel of claim 5 wherein the number average molecular weight of polymer (B) is less than about 2000 and the hydroxyl number is at least about 50.
Claim 12
Dependent Claim
13 words
A film wherein the polymer content comprises the polymer blend of claim 1.
Claim 13
Dependent Claim
14 words
A molding resin wherein the polymer content comprises the polymer blend of claim 1.
Claim 14
Dependent Claim
14 words
A consolidated body wherein the polymer content comprises the polymer blend of claim 1.
Claim 15
Dependent Claim
16 words
The blend of claim 1 wherein acrylic star polymer (A) is made by group transfer polymerization.
Claim 16
Dependent Claim
96 words
The blend of claim 14 wherein acrylic star polymer (A) is made by an arm/core process comprising (A) preparing a "living" polymer by reacting a group transfer initiator with one or more monomers having a carbon-carbon double bond polymerizable by a group transfer polymerization process; (B) contacting the resulting "living" polymers with a mixture comprising i. 1-100% by weight of a monomer having at least two carbon-carbon double bonds polymerizable by a group transfer polymerizable process and ii. 0-99% by weight of a monomer having one carbon-carbon double bond polymerizable by a group transfer polymerization process.
Claim 17
Dependent Claim
17 words
The blend of claim 1 wherein polymer (B) has a backbone of polyester, polyether or polyurethane, polymer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-03-25 | 1994-09-24 | 1995-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-25 | 1998-09-24 | 1999-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-25 | 2002-09-24 | 2003-03-26 | $7700.00 | Window Closed / Lapsed |