Patent EP0176328A2 successfully refreshed from Google Patents.
EP0176328A2
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Methylystyrene copolymer
Assignee: Tonen General Sekiyu KK
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Filing: 1985-09-20
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Granted: —
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Expires: 2005-09-20
Abstract
Abstract A copolymer of methylstyrene containing at least 80 mol% para-methylisomer and maleimide or N-substituted maleimide exhibits high temperature stability suitable for use in automotive parts, electrical appliances, office equipment and electronics parts.
Inventors
- 👤 Masayuki Kato
- 👤 Yoshio Taguchi
- 👤 Chihiro Imai
- 👤 Tokuo Makishima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 08:48
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
66 words
A methylstyrene copolymer comprising: (A) 60 to 99 mol% of the structural units represented by the following formula: wherein at least 80 mol% the methyl groups are at the para position; (B) 40 to 1 mol% of the structural units represented by the following formula: wherein R is a hydrogen atom, a C 1 -C 6 alkyl group, or a C 6 -C 10 aryl group.
Claim 2
Dependent Claim
66 words
A methylstyrene copolymer comprising: (A) 60 to 99 mol% of the structural units represented by the following formula: wherein at least 80 mol% the methyl groups are at the para position; (B) 40 to 1 mol% of the structural units represented by the following formula: wherein R is a hydrogen atom, a C 1 -C 6 alkyl group, or a C 6 -C 10 aryl group.
Claim 3
Dependent Claim
32 words
The copolymer of claim 1, wherein the structural units (A) are derived from methylstyrene comprising from 95 to 99 wt% p-methylstyrene, 1 to 5 wt% m-methylstyrene, and 0 to 0.5 wt% c-methylstyrene.
Claim 4
Dependent Claim
36 words
The copolymer of claim 1 or claim 2, wherein the structural units (A) comprise from 65 to 97 mol% of the copolymer and the structural units (B) comprise from 3 to 35 mol% of the copolymer.
Claim 5
Dependent Claim
25 words
The copolymer of claim 3, wherein the units (A) comprise from 80 to 95 mol% and the units (B) comprise from 5 to 20 mol%.
Claim 6
Dependent Claim
14 words
The copolymer of any claims 1 to 4, wherein R is a phenyl group.
Claim 7
Dependent Claim
28 words
The copolymer of any claims 1 to 5, wherein the copolymer has a molecular weight of from 10,000 to 300,000 and a Mw/Mn of from 1.5 to 4.0.
Claim 8
Dependent Claim
29 words
A copolymer as defined in claim 6, wherein the copolymer has a Mw of from 10,000 to 100,000 and a M w/ M n of from 2 to 3.
Claim 9
Dependent Claim
18 words
The copolymer of any of claims 1 to 7, wherein the copolymer has a triad distribution as follows:
Claim 10
Dependent Claim
50 words
A copolymer of any of claims 1 to 8, wherein the copolymer has the following natural thermal properties: decomposition temperature: above 285°C Vicat softening temperature: above 125°C Geer test weight loss: decomposition temperature below 300°C - less than 1.0% and for decomposition temperatures of 300°C and above, less than 2.0%.
Claim 11
Independent Claim
91 words
A method of preparing a heat resistant copolymer comprising: (a) adding maleimide or an N-(C 1-6 alkyl or C 6-10 aryl) - maleimide to methylstyrene, at least 80 mol% of which is p-methylstyrene, under polymerization conditions and at a substantially constant rate over a period substantially equal to 50 to 90% of the total polymerization time, the total ratio of said maleinimide and said methylstyrene being between 1:4 and 1:19; and (b) continuing polymerization at polymerization conditions for a period substantially equal to 50 to 10% of the total polymerization time.
Claim 12
Independent Claim
91 words
A method of preparing a heat resistant copolymer comprising: (a) adding maleimide or an N-(C 1-6 alkyl or C 6-10 aryl) - maleimide to methylstyrene, at least 80 mol% of which is p-methylstyrene, under polymerization conditions and at a substantially constant rate over a period substantially equal to 50 to 90% of the total polymerization time, the total ratio of said maleinimide and said methylstyrene being between 1:4 and 1:19; and (b) continuing polymerization at polymerization conditions for a period substantially equal to 50 to 10% of the total polymerization time.
References Cited (Backward Citations)
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