US4439567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for injection molding polyolefin resin compositions
Assignee: Mitsui Toatsu Chemicals Inc
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Filing: 1982-07-08
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Granted: 1984-03-27
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Expires: 2002-07-08
Abstract
Abstract There is provided a polyolefin resin composition for injection molding which comprises adding to polyolefin a condensate of sorbitol with an aldehyde compound and a lubricant of 1/20 to 1/2 parts by weight based on 1.0 part by weight of said condensate. Thereby polyolefin injection moldings with good transparency are obtained without bringing a foaming phenomenon.
Inventors
- 👤 Takeo Inoue
- 👤 Jun Otsu
- 👤 Tateyo Sasaki
- 👤 Hiroyuki Doi
- 👤 Keigo Suehiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:35
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/156; C08K5/1575; C08K5/10; C08K5/101; C08K5/16; C08K5/20; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
105 words
A process for producing injection molded polyolefin products of good transparency without foaming or blistering which comprises forming a polyolefin resin composition by adding to a polyolefin a condensate of sorbitol with an aldehyde compound and a lubricant in an amount of 1/20-1/2 parts by weight based on 1.0 part by weight of said condensate, wherein said lubricant is at least one member selected from the group consisting of a saturated or unsaturated aliphatic amide having 3-30 carbon atoms and its derivatives, a saturated or unsaturated aliphatic monocarboxylic acid ester having 3-30 carbon atoms, and a silicone compound, and injection molding said polyolefin resin composition.
Claim 2
Dependent Claim
105 words
A process for producing injection molded polyolefin products of good transparency without foaming or blistering which comprises forming a polyolefin resin composition by adding to a polyolefin a condensate of sorbitol with an aldehyde compound and a lubricant in an amount of 1/20-1/2 parts by weight based on 1.0 part by weight of said condensate, wherein said lubricant is at least one member selected from the group consisting of a saturated or unsaturated aliphatic amide having 3-30 carbon atoms and its derivatives, a saturated or unsaturated aliphatic monocarboxylic acid ester having 3-30 carbon atoms, and a silicone compound, and injection molding said polyolefin resin composition.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein the condensate content is comprised between 0.05 and 2 parts by weight based on 100 parts by weight of the polyolefin.
Claim 4
Dependent Claim
53 words
The process of claim 1 wherein said condensate is at least one member represented by the formulae, ##STR2## wherein R 1 and R 2 each is a saturated or unsaturated alkyl group of 1 to 30 carbon atoms, an alicyclic hydrocarbon group or its derivatives, or an aromatic hydrocarbon group or its derivatives.
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) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |