US4097553A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylic graft copolymers blended with acrylic resins
Assignee: ICI Acrylics Inc
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Filing: 1977-06-20
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Granted: 1978-06-27
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Expires: 1997-06-20
Abstract
Abstract A process which improves the handleability of resilient, acrylic graft rubber particles which comprises coagulating the rubber particles, then contacting the coagulated particles in the coagulation medium with a dispersion of a non-resilient alkyl methacrylate resin and coagulating the alkyl methacrylate resin on the surface of the rubber particles. The particles of alkyl methacrylate resin adhere to the rubber particles and prevent the normally sticky rubber particles from adhering to one another.
Inventors
- 👤 Ernest Richard Novak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:09
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/16; C08F; C08F285/00; C08J3/005; C08J2351/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
235 words
A method of improving the handleability of a resilient, acrylic graft rubber composed of particles having an outer layer consisting essentially of an alkyl methacrylate polymer which has a glass transition temperature greater than 25° C. and the alkyl group has 1-4 carbon atoms, and at least one inner layer consisting essentially of a resilient acrylic copolymer that has a glass transition temperature of 25° C or less which comprises mixing the acrylic graft rubber while still in its emulsion polymerization medium with a solution of an ionizable salt in which the salt is present in an amount between about 1 and 100 gm/liter in an amount such that the resulting mixture contains between about 5 and about 25 times by weight as much acrylic graft rubber as ionizable salt, and, agitating the resulting mixture at a temperature between about 30°-70° C. until the graft rubber particles coagulate, then adding to the coagulated dispersion a dispersion of an alkyl methacrylate resin prepared by emulsion polymerization which has a glass transition temperature greater than 25° C. and the alkyl group has 1-4 carbon atoms, in an amount sufficient to result in the presence of between about 10 and 99% by weight acrylic graft rubber in the resulting mixture based on weight of rubber and said alkyl methacrylate resin, and agitating the resulting mixture at a temperature between about 60°-120° C., followed by isolating the coagulated materials.
Claim 2
Independent Claim
235 words
A method of improving the handleability of a resilient, acrylic graft rubber composed of particles having an outer layer consisting essentially of an alkyl methacrylate polymer which has a glass transition temperature greater than 25° C. and the alkyl group has 1-4 carbon atoms, and at least one inner layer consisting essentially of a resilient acrylic copolymer that has a glass transition temperature of 25° C or less which comprises mixing the acrylic graft rubber while still in its emulsion polymerization medium with a solution of an ionizable salt in which the salt is present in an amount between about 1 and 100 gm/liter in an amount such that the resulting mixture contains between about 5 and about 25 times by weight as much acrylic graft rubber as ionizable salt, and, agitating the resulting mixture at a temperature between about 30°-70° C. until the graft rubber particles coagulate, then adding to the coagulated dispersion a dispersion of an alkyl methacrylate resin prepared by emulsion polymerization which has a glass transition temperature greater than 25° C. and the alkyl group has 1-4 carbon atoms, in an amount sufficient to result in the presence of between about 10 and 99% by weight acrylic graft rubber in the resulting mixture based on weight of rubber and said alkyl methacrylate resin, and agitating the resulting mixture at a temperature between about 60°-120° C., followed by isolating the coagulated materials.
Claim 3
Dependent Claim
118 words
The method of claim 1 wherein the alkyl methacrylate polymer in said outer layer is produced from a monomer mixture of about 50 to 100 weight percent alkyl methacrylate and any remainder is selected from styrene, alkyl acrylate wherein the alkyl group has 1-4 carbon atoms, or a mixture thereof; wherein the resilient acrylic copolymer is produced from a monomer mixture of about 70-90 weight percent alkyl acrylate wherein the alkyl group has 1-4 carbon atoms and the remainder is a copolymerizable monomer selected from styrene, hydroxy-lower alkyl acrylate, hydroxy-lower alkyl methacrylate, and lower alkyl substituted styrene, and wherein the resilient acrylic copolymer is present in at least one inner layer that is adjacent to the outer layer.
Claim 4
Dependent Claim
95 words
The method of claim 2 wherein the alkyl methacrylate polymer in said outer layer is a copolymer produced from a monomer mixture of at least 90 weight % methyl methacrylate with the remainder being ethyl acrylate; the resilient acrylic copolymer is a copolymer produced from a monomer mixture of 70-90 weight % butyl acrylate with the remainder being styrene; and the alkyl methacrylate resin employed in the dispersion of an alkyl methacrylate resin is a copolymer produced from a monomer mixture of at least 95 weight % methyl methacrylate with the remainder being ethyl acrylate.
Claim 5
Dependent Claim
71 words
The method of claim 2 wherein the polymer of the outer layer of the acrylic graft rubber particles has a glass transition temperature of 50° C. or more, the resilient acrylic copolymer of the adjacent inner layer has a glass transition temperature of 10° C. or less; and the alkyl methacrylate resin employed in the dispersion of an alkyl methacrylate resin has a glass transition temperature of 50° C. or more.
Claim 6
Dependent Claim
54 words
The method of claim 4 wherein the amount of alkyl methacrylate resin in the dispersion of an alkyl methacrylate resin is sufficient to result in the presence of 70-98% by weight acrylic graft rubber based on weight of rubber and said alkyl methacrylate resin in the resulting mixture obtained after carrying out both coagulations.
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) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |