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US4490508A
Expired / Lapsed
US
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Graft-modified copolymer and compounding agent for styrene-type polymer containing the same
Assignee: Mitsui Chemicals Inc
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Filing: 1983-03-30
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Granted: 1984-12-25
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Expires: 2003-03-30
Abstract
Abstract A graft-modified copolymer having a melt flow rate of 0.01 to 100 g/10 min at a temperature of 230° C. under a load of 2160 g. The graft-modified copolymer is prepared by grafting (a) 100 parts by weight of low crystalline or amorphous ethylene-alpha-olefin copolymer having an ethylene content of 40 to 93 mole%, a melt flow rate of 0.1 to 50 g/10 min at a temperature of 230° C. under a load of 2160 g, and a density of 0.90 g/cm 3 or less with (b) 0.3 to 50 parts by weight of a styrene-type hydrocarbon. This graft-modified copolymer is suitable for use as a compounding agent for improving the impact resistance of styrene-type polymers without decreasing the surface hardness, weathering resistance, and molding properties thereof.
Inventors
- 👤 Riichiro Nagano
- 👤 Toshihiro Sagane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:11
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
A graft-modified copolymer having a melt flow rate of 0.01 to 100 g/10 min at a temperature of 230° C. under a load of 2160 g, said graft-modified copolymer being prepared by grafting (a) 100 parts by weight of low crystalline or amorphous ethylene-alpha-olefin copolymer having an ethylene content of 40 to 93 mole%, a melt flow rate of 0.1 to 50 g/10 min at a temperature of 230° C. under a load of 2160 g, a density of 0.90 g/cm 3 or less and having a crystallinity index of 0% to 50% with (b) 0.3 to 50 parts by weight of a styrene-type hydrocarbon.
Claim 2
Dependent Claim
105 words
A graft-modified copolymer having a melt flow rate of 0.01 to 100 g/10 min at a temperature of 230° C. under a load of 2160 g, said graft-modified copolymer being prepared by grafting (a) 100 parts by weight of low crystalline or amorphous ethylene-alpha-olefin copolymer having an ethylene content of 40 to 93 mole%, a melt flow rate of 0.1 to 50 g/10 min at a temperature of 230° C. under a load of 2160 g, a density of 0.90 g/cm 3 or less and having a crystallinity index of 0% to 50% with (b) 0.3 to 50 parts by weight of a styrene-type hydrocarbon.
Claim 3
Dependent Claim
17 words
A graft-modified copolymer as claimed in claim 1, wherein said ethylene-alpha-olefin copolymer further contains a diene monomer.
Claim 4
Dependent Claim
113 words
A compounding agent for a styrene-type polymer comprising a graft-modified copolymer having a melt flow rate of 0.01 to 100 g/10 min at a temperature of 230° C. under a load of 2160 g, said graft-modified copolymer being prepared by grafting (a) 100 parts by weight of low crystalline or amorphous ethylene-alpha-olefin copolymer having an ethylene content of 40 to 93 mole%, a melt flow rate of 0.1 to 50 g/10 min at a temperature of 230° C. under a load of 2160 g, a density of 0.90 g/cm 3 or less and having a crystallinity index of 0% to 50% with (b) 0.3 to 50 parts by weight of a styrene-type hydrocarbon.
Claim 5
Dependent Claim
113 words
A compounding agent for a styrene-type polymer comprising a graft-modified copolymer having a melt flow rate of 0.01 to 100 g/10 min at a temperature of 230° C. under a load of 2160 g, said graft-modified copolymer being prepared by grafting (a) 100 parts by weight of low crystalline or amorphous ethylene-alpha-olefin copolymer having an ethylene content of 40 to 93 mole%, a melt flow rate of 0.1 to 50 g/10 min at a temperature of 230° C. under a load of 2160 g, a density of 0.90 g/cm 3 or less and having a crystallinity index of 0% to 50% with (b) 0.3 to 50 parts by weight of a styrene-type hydrocarbon.
Claim 6
Dependent Claim
17 words
A compounding agent as claimed in claim 3, wherein said ethylene-alpha-olefin copolymer further contains a diene monomer.
Claim 7
Dependent Claim
108 words
A process for producing a graft-modified copolymer having a melt flow rate of 0.01 to 100 g/10 min at a temperature of 230° C. under a load of 2160 g, comprising the step of graft copolymerizing (a) 100 parts by weight of low crystalline or amorphous ethylene-alpha-olefin copolymer having an ethylene content of 40 to 93 mole%, a melt flow rate of 0.1 to 50 g/10 min at a temperature of 230° C. under a load of 2160 g, a density of 0.90 g/cm 3 or less and having a crystallinity index of 0% to 50% with (b) 0.3 to 50 parts by weight of a styrene-type hydrocarbon.
Claim 8
Dependent Claim
108 words
A process for producing a graft-modified copolymer having a melt flow rate of 0.01 to 100 g/10 min at a temperature of 230° C. under a load of 2160 g, comprising the step of graft copolymerizing (a) 100 parts by weight of low crystalline or amorphous ethylene-alpha-olefin copolymer having an ethylene content of 40 to 93 mole%, a melt flow rate of 0.1 to 50 g/10 min at a temperature of 230° C. under a load of 2160 g, a density of 0.90 g/cm 3 or less and having a crystallinity index of 0% to 50% with (b) 0.3 to 50 parts by weight of a styrene-type hydrocarbon.
Claim 9
Dependent Claim
25 words
A process as claimed in claim 5, wherein said graft copolymerization is carried out in a molten state in the presence of a radical initiator.
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) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |