Patent US4080359A successfully refreshed from Google Patents.
US4080359A
Expired / Lapsed
US
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Talc containing polyolefin compositions
Assignee: Mitsubishi Chemical Corp
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Filing: 1977-07-20
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Granted: 1978-03-21
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Expires: 1997-07-20
Abstract
Abstract A polyolefin composition comprising: (1) about 70 to about 35% by weight of a polyolefin; (2) about 30 to about 65% by weight of a talc containing a metal content of up to about 0.9% by weight; and (3) based on the total amount of (1) and (2), at least 0.02% by weight of a specific alkyl 3,5-di-t-butyl-4-hydroxy-hydrocinnamate and at least 0.03% by weight of a specific dialkyl thiodipropionate or acetate. A sheet formed from this composition is odor free, has good whiteness, and can be fabricated into food packaging containers by a vacuum or pressure forming technique.
Inventors
- 👤 Hiroshi Yui
- 👤 Atsushi Maeda
- 👤 Tomohiko Takahama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:35
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/134; C08K5/1345; B; B65; B65D; B65D65/00; B65D65/38; C08K3/00; C08K3/34; C08K5/36; C08K5/37; C08K5/372
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
A talc-containing polyolefin composition consisting essentially of (1) about 70 to about 35% by weight of polyolefin; (2) about 30 to about 65% by weight of a talc wherein the sum of Fe and Al content is up to about 0.9% by weight, and (3) (A) at least 0.02% by weight, based on the total amount of the polyolefin (1) and the talc (2), of a compound of the following general formula: ##STR3## wherein R 1 is a straight chain or branched chain alkyl group; and (B) at least 0.03% by weight, based on the total amount of the polyolefin (1) and the talc (2), of a compound of the following general formula ##STR4## wherein R 2 and R 3 represent an alkyl group containing 2 or 3 carbon atoms, and R 4 and R 5 represent a straight chain or branched chain alkyl group.
Claim 2
Dependent Claim
145 words
A talc-containing polyolefin composition consisting essentially of (1) about 70 to about 35% by weight of polyolefin; (2) about 30 to about 65% by weight of a talc wherein the sum of Fe and Al content is up to about 0.9% by weight, and (3) (A) at least 0.02% by weight, based on the total amount of the polyolefin (1) and the talc (2), of a compound of the following general formula: ##STR3## wherein R 1 is a straight chain or branched chain alkyl group; and (B) at least 0.03% by weight, based on the total amount of the polyolefin (1) and the talc (2), of a compound of the following general formula ##STR4## wherein R 2 and R 3 represent an alkyl group containing 2 or 3 carbon atoms, and R 4 and R 5 represent a straight chain or branched chain alkyl group.
Claim 3
Dependent Claim
17 words
The composition of claim 1, wherein the amount of the talc is 35 to 50% by weight.
Claim 4
Dependent Claim
13 words
The composition of claim 1, wherein the polyolefin is a propylene/ethylene block copolymer.
Claim 5
Dependent Claim
23 words
The composition of claim 1, wherein the sum of Fe and Al content in the talc is about 0.5% by weight or less.
Claim 6
Dependent Claim
14 words
The composition of claim 1, wherein said component (A) is stearyl 3,5-di-t-butyl-4-hydroxy-hydrocinnamate or tetrakis-methane.
Claim 7
Dependent Claim
18 words
The composition of claim 1, wherein said component (B) is distearyl thiodipropionate, dilauryl thiodipropionate or lauryl stearyl thiodipropionate.
Claim 8
Dependent Claim
16 words
A sheet composed of the composition of claim 1, for the production of food packaging containers.
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) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |