US3985704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methacrylate-butadiene-styrene graft polymers and process for their production
Assignee: Rohm and Haas Co
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Filing: 1975-06-19
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Granted: 1976-10-12
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Expires: 1995-06-19
Abstract
Abstract Multi-stage impact modifier having a high rubber content prepared by a process which includes isolation by spray drying in the presence of fumed silica or another inert particulate material in the gaseous drying medium.
Inventors
- 👤 Donald H. Jones
- 👤 William J. Ferry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:47
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/122; C08F; C08F279/00; C08F279/02; C08F279/06; C08F285/00; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08J2351/00; C08J2351/04; C08L51/00; C08L51/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
88 words
A process for producing a multiple stage, sequentially produced, impact modifier having a high butadiene content comprising graft polymerizing methyl methacrylate and styrene in any order onto a polymerized butadiene or butadiene-styrene polymer so as to form a latex of a two or more stage polymer, spray drying the resultant graft polymer latex while blowing 0.01 to 5% by weight inert particulate material into the gaseous spray drying medium in the spray dryer, the rubber content of the resultant graft polymer being at least about 70% by weight.
Claim 2
Dependent Claim
88 words
A process for producing a multiple stage, sequentially produced, impact modifier having a high butadiene content comprising graft polymerizing methyl methacrylate and styrene in any order onto a polymerized butadiene or butadiene-styrene polymer so as to form a latex of a two or more stage polymer, spray drying the resultant graft polymer latex while blowing 0.01 to 5% by weight inert particulate material into the gaseous spray drying medium in the spray dryer, the rubber content of the resultant graft polymer being at least about 70% by weight.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the rubber content of the graft polymer is above 75%.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein the inert particulate material is fumed silica.
Claim 5
Dependent Claim
32 words
The process of claim 1 wherein the inert particulate material is selected from the group consisting of aluminum silicate, calcium carbonate, carbon black, titanium dioxide, polymethyl methacrylate, zinc oxide, and infusorial earth.
Claim 6
Dependent Claim
33 words
The process of claim 1 wherein 0.01 to 5% fumed silica based on weight of dry graft polymer is introduced into the drying chamber as a solid suspended in the gaseous drying medium.
Claim 7
Dependent Claim
16 words
The process of claim 5 wherein the butadiene rubber stage further includes polyethylenically unsaturated cross-linking monomer.
Claim 8
Dependent Claim
9 words
The product produced by the process of claim 1.
Claim 9
Dependent Claim
16 words
Polyvinyl chloride impact-modified with about 1 to 30% by weight of the product of claim 7.
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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |