Patent US3958573A successfully refreshed from Google Patents.
Patent US3985703A successfully refreshed from Google Patents.
US3985703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacture of acrylic core/shell polymers
Assignee: Rohm and Haas Co
•
Filing: 1975-06-24
•
Granted: 1976-10-12
•
Expires: 1995-06-24
Abstract
Abstract A process for the isolation of acrylic core/shell polymers with a high percentage of a rubbery phase by spraydrying in the presence of inert particulate material such as fumed silica in the gaseous drying medium.
Inventors
- 👤 William J. Ferry
- 👤 Donald H. Jones
- 👤 Roger K. Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:53
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/122; C08F; C08F265/00; C08F265/04; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L77/00; C08J2351/00; C08L51/00; C08L51/003; Y; Y10; Y10S; Y10S525/00; Y10S525/902
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
A process for producing an acrylic core/shell polymer having 55 to 85 parts of an acrylic rubbery core comprising polymerizing 15 to 45 parts of a hard shell polymer onto a pre-formed rubbery core polymer under emulsion conditions and spray-drying the resultant latex in a spray dryer while blowing 0.01 to 1.5 parts inert particulate material into the gaseous drying media of the spray dryer.
Claim 2
Dependent Claim
65 words
A process for producing an acrylic core/shell polymer having 55 to 85 parts of an acrylic rubbery core comprising polymerizing 15 to 45 parts of a hard shell polymer onto a pre-formed rubbery core polymer under emulsion conditions and spray-drying the resultant latex in a spray dryer while blowing 0.01 to 1.5 parts inert particulate material into the gaseous drying media of the spray dryer.
Claim 3
Dependent Claim
30 words
The process of claim 1 where the core is 55 to 85 parts of crosslinked alkyl acrylate polymer and the shell 15 to 45 parts of lower alkyl methacrylate polymer.
Claim 4
Dependent Claim
50 words
The process of claim 1 where the rubbery core is 55 to 85 parts of a copolymer of 79 to 99.5 parts n-butyl acrylate, 0 to 10 parts of one or more monovinyl or conjugated divinyl monomers, 0.1 to 5 parts crosslinking monomer, and 0.1 to 5 parts graftlinking monomer.
Claim 5
Dependent Claim
31 words
The process of claim 3 where the hard shell is 80 to 100 parts methyl methacrylate, 0 to 20 parts monovinylidene unsaturated monomer and 0 to 5 parts unsaturated carboxylic acid.
Claim 6
Dependent Claim
34 words
The process of claim 1 where about 0.01 to 1.5% fumed silica based on weight of dry core/shell polymer is introduced into the drying chamber as a solid suspended in the gaseous drying medium.
Claim 7
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 8
Dependent Claim
14 words
The product in free flowing powder form produced by the process of claim 1.
Claim 9
Dependent Claim
9 words
Thermoplastic polymers modified with 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 |