Patent US4180529A successfully refreshed from Google Patents.
US4180529A
Expired / Lapsed
US
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Acrylic multistage graft copolymer products and processes
Assignee: ICI Acrylics Inc
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Filing: 1979-01-12
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Granted: 1979-12-25
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Expires: 1999-01-12
Abstract
Abstract A resilient, acrylic graft polymer is produced by multi-stage, sequential polymerization in which the first stage is elastomeric, the second stage is nonelastomeric, the third stage is elastomeric and the fourth, and final stage is nonelastomeric. Upon blending with a nonresilient methacrylic matrix resin, followed by molding, an impact resistant molded product is obtained which has low stress-whitening, generally does not show substantial crack propagation on impact and does not readily break on subjection to fold endurance tests.
Inventors
- 👤 George H. Hofmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:42
CPC Classifications
C; C08; C08F; C08F285/00; C08F265/00; C08F265/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
403 words
A resilient, acrylic, multi-stage, sequentially produced polymer characterized by (a) an elastomeric first stage comprising about 1-20% by weight of the polymer and having a glass transition temperature of between about -60° C. and 25° C., which is polymerized from a monomer mixture of 50 to 100 weight percent of at least one alkyl acrylate wherein the alkyl group contains 1 to 8 carbon atoms, 0 to 50 weight percent of another copolymerizable monoethylenically unsaturated monomer, 0 to 5 weight percent of a copolymerizable polyfunctional crosslinking monomer and 0 to 5 weight percent of a copolymerizable graftlinking monomer; (b) a nonelastomeric, relatively hard second stage comprising about 15-65% by weight of the polymer and having a glass transition temperature greater than 25° C., which is polymerized in the presence of the first stage product from a monomer mixture of 70 to 100 weight percent of at least one alkyl methacrylate wherein the alkyl group has 1 to 4 carbon atoms, 0 to 30 weight percent of another copolymerizable monoethylenically unsaturated monomer, 0 to 5 weight percent of a copolymerizable polyfunctional crosslinking monomer and 0 to 5 weight percent of a copolymerizable graftlinking monomer; (c) an elastomeric third stage, comprising about 30-75% by weight of the polymer and having a glass transition temperature of between about -60° and 25° C., which is polymerized in the presence of the first and second stage product from a monomer mixture of 50 to 100 weight percent of at least one alkyl acrylate wherein alkyl group contains 1 to 8 carbon atoms, 0 to 50 weight percent of another copolymerizable monoethylenically unsaturated monomer, 0 to 5 weight percent of a copolymerizable polyfunctional crosslinking monomer and 0 to 5 weight percent of a copolymerizable graftlinking monomer; (d) a nonelastomeric, relatively hard fourth stage comprising about 5-40% by weight of the polymer and having glass transition temperature greater than 25° C. which is polymerized in the presence of the first, second and third stage product from a monomer mixture of 70 to 100 weight percent of at least one alkyl methacrylate wherein the alkyl group has 1 to 4 carbon atoms, 0 to 30 weight percent of another copolymerizable monoethylenically unsaturated monomer, 0 to 5 weight percent of a copolymerizable polyfunctional crosslinking monomer and 0 to 5 weight percent of a copolymerizable graftlinking monomer; said first and third stage combined comprising at least 40 percent by weight of the polymer.
Claim 2
Dependent Claim
403 words
A resilient, acrylic, multi-stage, sequentially produced polymer characterized by (a) an elastomeric first stage comprising about 1-20% by weight of the polymer and having a glass transition temperature of between about -60° C. and 25° C., which is polymerized from a monomer mixture of 50 to 100 weight percent of at least one alkyl acrylate wherein the alkyl group contains 1 to 8 carbon atoms, 0 to 50 weight percent of another copolymerizable monoethylenically unsaturated monomer, 0 to 5 weight percent of a copolymerizable polyfunctional crosslinking monomer and 0 to 5 weight percent of a copolymerizable graftlinking monomer; (b) a nonelastomeric, relatively hard second stage comprising about 15-65% by weight of the polymer and having a glass transition temperature greater than 25° C., which is polymerized in the presence of the first stage product from a monomer mixture of 70 to 100 weight percent of at least one alkyl methacrylate wherein the alkyl group has 1 to 4 carbon atoms, 0 to 30 weight percent of another copolymerizable monoethylenically unsaturated monomer, 0 to 5 weight percent of a copolymerizable polyfunctional crosslinking monomer and 0 to 5 weight percent of a copolymerizable graftlinking monomer; (c) an elastomeric third stage, comprising about 30-75% by weight of the polymer and having a glass transition temperature of between about -60° and 25° C., which is polymerized in the presence of the first and second stage product from a monomer mixture of 50 to 100 weight percent of at least one alkyl acrylate wherein alkyl group contains 1 to 8 carbon atoms, 0 to 50 weight percent of another copolymerizable monoethylenically unsaturated monomer, 0 to 5 weight percent of a copolymerizable polyfunctional crosslinking monomer and 0 to 5 weight percent of a copolymerizable graftlinking monomer; (d) a nonelastomeric, relatively hard fourth stage comprising about 5-40% by weight of the polymer and having glass transition temperature greater than 25° C. which is polymerized in the presence of the first, second and third stage product from a monomer mixture of 70 to 100 weight percent of at least one alkyl methacrylate wherein the alkyl group has 1 to 4 carbon atoms, 0 to 30 weight percent of another copolymerizable monoethylenically unsaturated monomer, 0 to 5 weight percent of a copolymerizable polyfunctional crosslinking monomer and 0 to 5 weight percent of a copolymerizable graftlinking monomer; said first and third stage combined comprising at least 40 percent by weight of the polymer.
Claim 3
Dependent Claim
55 words
The polymer of claim 1 wherein: the elastomeric first stage comprises about 3-10% by weight of the polymer, the nonelastomeric second stage comprises about 20-30% by weight of the polymer, the elastomeric third stage comprises about 40-60% by weight of the polymer, and the nonelastomeric fourth stage comprises about 10-20% by weight of the polymer.
Claim 4
Dependent Claim
30 words
The polymer of claim 2 wherein the glass transition temperature of each of the elastomeric first stage and the elastomeric third stage is between about -35° C. and -20° C.
Claim 5
Dependent Claim
24 words
The polymer of claim 1 wherein the alkyl acrylate present in the elastomeric first stage and in the elastomeric third stage is butyl acrylate.
Claim 6
Dependent Claim
23 words
The polymer of claim 4 wherein the alkyl methacrylate present in the nonelastomeric second stage and the nonelastomeric fourth stage is methyl methacrylate.
Claim 7
Dependent Claim
36 words
The polymer of claim 4 wherein the monomer mix of the nonelastomeric second stage contains methyl methacrylate, ethyl acrylate and allylmethacrylate; and the monomer mix of the nonelastomeric fourth stage contains methyl methacrylate and ethyl acrylate.
Claim 8
Dependent Claim
28 words
A blend of 5-80 percent by weight of the resilient, acrylic graft polymer defined in claim 1 with 20-95 percent by weight of a nonresilient thermoplastic methacrylate resin.
Claim 9
Dependent Claim
38 words
A blend of 5-80 percent by weight of the resilient acrylic graft polymer defined in claim 5 with 20-95 percent by weight of a nonresilient thermoplastic methacrylate resin which is a copolymer of methyl methacrylate and ethyl acrylate.
Claim 10
Dependent Claim
17 words
The polymer of claim 1 wherein the elastomeric first stage comprises 3-20% by weight of the polymer.
Claim 11
Dependent Claim
28 words
A blend of 5-80 percent by weight of the resilient, acrylic graft polymer defined in claim 9 with 20-95 percent by weight of a nonresilient thermoplastic methacrylate resin.
Claim 12
Dependent Claim
17 words
The polymer of claim 1 wherein the elastomeric first stage comprises 10-20% by weight of the polymer.
Claim 13
Dependent Claim
28 words
A blend of 5-80 percent by weight of the resilient, acrylic graft polymer defined in claim 11 with 20-95 percent by weight of a nonresilient thermoplastic methacrylate resin.
Claim 14
Dependent Claim
16 words
The polymer of claim 1, 9 or 11 wherein the elastomeric first stage contains a seed.
Claim 15
Dependent Claim
28 words
A blend of 5-80 percent by weight of the resilient, acrylic graft polymer defined in claim 13 with 20-95 percent by weight of a nonresilient thermoplastic methacrylate resin.
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) | 1982-12-24 | 1983-06-25 | 1983-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-24 | 1987-06-25 | 1987-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-24 | 1991-06-25 | 1991-12-25 | $7700.00 | Window Closed / Lapsed |