US4275178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powdery graft-copolymer composition
Assignee: Kureha Corp
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Filing: 1979-12-28
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Granted: 1981-06-23
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Expires: 1999-12-28
Abstract
Abstract Graft-copolymers for improving impact strength comprising a relatively large quantity of an elastomeric trunk polymer, such as acrylonitrile/styrene/butadiene resins and methyl methacrylate/styrene/butadiene resins, have some undesirable powder characteristics, for example, poor fluidity and an easily blocking property. However, by blending a graft-copolymer of this type with a graft-copolymer comprising a relatively small quantity of an elastomeric trunk polymer in slurry form or dry state, it is possible to obtain a graft-copolymer blend with improved powder characteristics without significantly lowering the effect of improving the impact strength of the former graft-copolymer. The graft-copolymer blend thus obtained, when blended with a hard resin such as polyvinyl chloride, provides a resin composition with high impact strength.
Inventors
- 👤 Haruhiko Yusa
- 👤 Masanori Oota
- 👤 Katsumi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:26
CPC Classifications
C; C08; C08L; C08L51/00; C08L51/003; C08L51/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
122 words
A powdery graft-copolymer composition comprising a blend of 100 parts of a graft-copolymer (A) comprising 50 to 80% of an elastomeric trunk polymer, and 50 to 20% of a branch polymer of a hard-resin producing monomer grafted on the elastomeric trunk polymer; and 0.1 to 25 parts of a graft-copolymer (B) comprising 5 to 49% of an elastomeric trunk polymer, and 95 to 51% of a branch polymer of a hard-resin producing monomer grafted on the elastomeric trunk polymer, both the graft-copolymers (A) and (B) having been obtained through emulsion graft-copolymerication, and wherein said graft-copolymer composition has been obtained by blending the graft-copolymers (A) and (B) in slurry form followed by drying all quantities expressed in parts and percentages being by weight.
Claim 2
Dependent Claim
122 words
A powdery graft-copolymer composition comprising a blend of 100 parts of a graft-copolymer (A) comprising 50 to 80% of an elastomeric trunk polymer, and 50 to 20% of a branch polymer of a hard-resin producing monomer grafted on the elastomeric trunk polymer; and 0.1 to 25 parts of a graft-copolymer (B) comprising 5 to 49% of an elastomeric trunk polymer, and 95 to 51% of a branch polymer of a hard-resin producing monomer grafted on the elastomeric trunk polymer, both the graft-copolymers (A) and (B) having been obtained through emulsion graft-copolymerication, and wherein said graft-copolymer composition has been obtained by blending the graft-copolymers (A) and (B) in slurry form followed by drying all quantities expressed in parts and percentages being by weight.
Claim 3
Dependent Claim
60 words
A powdery graft-copolymer composition as claimed in claim 1, wherein the graft-copolymer composition has been obtained by drying a slurry mixture obtained by adding a latex of a graft-copolymer (B) to a slurry of the graft-copolymer (A) and coagulating the same, said slurry of the graft-copolymer (A) having been prepared through the coagulation of a latex of the graft-copolymer (A).
Claim 4
Dependent Claim
60 words
A powdery graft-copolymer composition as claimed in claim 1, wherein the graft-copolymer composition has been obtained by drying a slurry mixture obtained by adding a latex of the graft-copolymer (A) to a slurry of the graft-copolymer (B) and coagulating the same, said slurry of the graft-copolymer (B) having been prepared through the coagulation of a latex of the graft-copolymer (B).
Claim 5
Dependent Claim
44 words
A powdery graft-copolymer composition as claimed in claim 1, wherein the graft-copolymer composition has been obtained by mixing slurries of the graft-copolymers (A) and (B) respectively obtained by coagulation of latexes of the graft-copolymers (A) and (B), and drying the slurry mixture thus obtained.
Claim 6
Dependent Claim
45 words
A powdery graft-copolymer composition as claimed in claim 1, wherein the elastomeric trunk polymer is selected from polymers of elastomer-producing monomers selected from butadiene, isoprene, chloroprene, and alkyl acrylates having 4 to 10 carbon atoms, and copolymers of said elastomer-producing monomers and monomers copolymerizable therewith.
Claim 7
Dependent Claim
33 words
A powdery graft-copolymer composition as claimed in claim 1, wherein the hard-resin producing monomer is selected from styrene, α-methyl styrene, methyl methacrylate, ethyl methacrylate, methyl acrylate, ethyl acrylate, acrylonitrile, methacrylonitrile, and vinyl chloride.
Claim 8
Dependent Claim
20 words
A resin composition with improved impact strength comprising a copolymer composition as claimed in claim 1 and a hard resin.
Claim 9
Dependent Claim
34 words
A resin composition as claimed in claim 7, wherein the hard resin is a vinyl chloride resin selected from polyvinyl chloride and copolymers of vinyl chloride as a principal constituent and monomers copolymerizable therewith.
References Cited (Backward Citations)
US3780134A
Cited
US4009227A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-22 | 1984-12-22 | 1985-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-22 | 1988-12-22 | 1989-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-22 | 1992-12-22 | 1993-06-23 | $7700.00 | Window Closed / Lapsed |