US4464487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing additive concentrates for carbonate polymers
Assignee: Dow Chemical Co
•
Filing: 1982-12-17
•
Granted: 1984-08-07
•
Expires: 2002-12-17
Abstract
Abstract Carbonate polymer compositions comprise a carbonate polymer having dispersed therein a concentrate consisting essentially of a copolymer of an alkenyl-aromatic monomer and an α,β-olefinically unsaturated nitrile monomer and a powdered or crystalline additive. The concentrates allow for good dispersion of additives in the carbonate polymer, provide for clean and efficient use of additives, and are easily processable. The copolymeric base resin does not deleteriously affect the good physical properties of the carbonate polymer with which it is blended at typical additive let down levels.
Inventors
- 👤 Lowell S. Thomas
- 👤 William P. Paige
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:12
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/22; C08J3/226; C08L; C08L69/00; C08J2369/00; C08J2425/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
77 words
An improved process for dispersing a dry powdered or crystalline additive into a carbonate polymer which comprises preparing a base concentrate by dry blending at a temperature lower than that employed in processing a carbonate polymer, a powdered or crystalline additive and a copolymer of an alkenylaromatic monomer and an α,β-olefinically unsaturated nitrile monomer; molding or extruding the base concentrate; dry blending said base concentrate with a carbonate polymer; and molding or extruding the carbonate polymer/base concentrate.
Claim 2
Dependent Claim
77 words
An improved process for dispersing a dry powdered or crystalline additive into a carbonate polymer which comprises preparing a base concentrate by dry blending at a temperature lower than that employed in processing a carbonate polymer, a powdered or crystalline additive and a copolymer of an alkenylaromatic monomer and an α,β-olefinically unsaturated nitrile monomer; molding or extruding the base concentrate; dry blending said base concentrate with a carbonate polymer; and molding or extruding the carbonate polymer/base concentrate.
Claim 3
Dependent Claim
13 words
A process of claim 1 wherein said carbonate polymer is homopolycarbonate of bisphenol-A.
Claim 4
Dependent Claim
14 words
A process of claim 1 wherein said powdered or crystalline additive is a pigment.
Claim 5
Dependent Claim
34 words
A process of claim 1 wherein said copolymer is prepared from copolymerizing about 15 to about 32 weight percent of α,β-olefinically unsaturated nitrile monomer with about 68 to about 85 weight percent alkenylaromatic monomer.
Claim 6
Dependent Claim
11 words
A process of claim 4 wherein said copolymer is styrene/acrylonitrile copolymer.
Claim 7
Dependent Claim
35 words
A process of claim 1 wherein said base concentrate consists essentially of from about 35 to about 99 weight percent of said copolymer and from about 1 to about 65 weight percent of said additive.
Claim 8
Dependent Claim
35 words
A process of claim 1 wherein said base concentrate consists essentially of from about 65 to about 99 weight percent of said copolymer and from about 1 to about 35 weight percent of said additive.
Claim 9
Dependent Claim
15 words
A process of claim 1 wherein said powdered or crystalline additive is a foaming agent.
Claim 10
Dependent Claim
32 words
A process of claim 1 wherein said carbonate polymer/base concentrate comprises from about 95 to about 99 weight percent carbonate polymer and from about 1 to about 5 weight percent base concentrate.
References Cited (Backward Citations)
US3239582A
Cited
DE2105487A1
Cited
US3755244A
Cited
US3989770A
Cited
US3925301A
Cited
US4001035A
Cited
US4097425A
Cited
US4163762A
Cited
US4148842A
Cited
US4343912A
Cited
US4373067A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-07 | 1988-02-06 | 1988-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-07 | 1992-02-06 | 1992-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-07 | 1996-02-06 | 1996-08-07 | $7700.00 | Window Closed / Lapsed |