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US4338228A
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Polyolefin composition containing (a) filler (b) nucleating agent and (c) heat deterioration inhibitor
Assignee: Tonen General Sekiyu KK
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Filing: 1980-10-07
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Granted: 1982-07-06
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Expires: 2000-10-07
Abstract
Abstract A polyolefin composition comprising a modified polyolefin obtained by adding an unsaturated carboxylic acid or an anhydride thereof to a polyolefin or mixtures of said modified polyolefin and an unmodified polyolefin, an inorganic filler, one or more nucleating agents or a combination thereof with one or more heat deterioration inhibitors, said polyolefin composition evidencing reduced deterioration by heat or reduction of its mechanical strength during a molding operation.
Inventors
- 👤 Hiroshi Inoue
- 👤 Masaaki Isoi
- 👤 Makoto Yoda
- 👤 Masato Komatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:55
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098; C08K13/00; C08K13/02; C08K3/00; C08K3/01; C08K3/013; C08L; C08L51/00; C08L51/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
75 words
A polyolefin composition comprising: (a) a modified polyolefin obtained by adding an unsaturated carboxylic acid or anhydride thereof to a polyolefin, or a mixture of said modified polyolefin and an unmodified polyolefin; (b) an inorganic filler; (c) at least one nucleating agent which is a metal salt of aliphatic carboxylic acid, aliphatic dicarboxylic acids, aromatic carboxylic acids, aromatic dicarboxylic acids or alkyl-substituted derivatives thereof, or dibenzylidenesorbitol; and (d) and at least one heat deterioration inhibitor.
Claim 2
Dependent Claim
75 words
A polyolefin composition comprising: (a) a modified polyolefin obtained by adding an unsaturated carboxylic acid or anhydride thereof to a polyolefin, or a mixture of said modified polyolefin and an unmodified polyolefin; (b) an inorganic filler; (c) at least one nucleating agent which is a metal salt of aliphatic carboxylic acid, aliphatic dicarboxylic acids, aromatic carboxylic acids, aromatic dicarboxylic acids or alkyl-substituted derivatives thereof, or dibenzylidenesorbitol; and (d) and at least one heat deterioration inhibitor.
Claim 3
Dependent Claim
11 words
The polyolefin composition of claim 1 wherein said polyolefin is polypropylene.
Claim 4
Dependent Claim
16 words
The polyolefin composition of claim 1 wherein said polyolefin is a copolymer of propylene and ethylene.
Claim 5
Dependent Claim
38 words
The polyolefin composition of claim 1 wherein the inorganic filler is selected from the group consisting of glass fibers, carbon fibers, talc, asbestos, glass powder, silica, alumina, clay, calcium carbonate, gypsum, anhydrous calcium sulfate, mica and iron oxide.
Claim 6
Dependent Claim
17 words
The composition of claim 4 wherein the inorganic filler is selected from glass, carbon fibers and talc.
Claim 7
Dependent Claim
25 words
The polyolefin composition of claim 1 wherein the heat deterioration inhibitor is selected from the group consisting of phenolic antioxidants, phosphorous antioxidants and sulphur antioxidants.
Claim 8
Dependent Claim
27 words
The polyolefin composition of claim 6 wherein the phenolic antioxidants are selected from the group consisting of 2,6-di-tert-butyl-p-cresol, 2,2'-methylene-bis(4-methyl-6-tert-butylphenol, tetrakis-[methylene-3-(3',5'-di-tert-butyl-4'-hydroxyphenyl) propionate] methane and tris-(3,5-di-tert-butyl-4-hydroxybenzoyl)isocyanate; or mixtures thereof.
Claim 9
Dependent Claim
14 words
The polyolefin composition of claim 6 wherein the deterioration inhibitor is cyclic neopentatetrylbis(octadecyl phosphite).
Claim 10
Dependent Claim
16 words
The polyolefin composition of claim 6 wherein the deterioration inhibitor is dilauryl thiodipropionate and distearyl thiodipropionate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-05 | 1986-01-04 | 1986-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-05 | 1990-01-04 | 1990-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-05 | 1994-01-04 | 1994-07-06 | $7700.00 | Window Closed / Lapsed |