US4762860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alcohol control of lightly crosslinked foamed polymer production
Assignee: Dow Chemical Co
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Filing: 1986-05-15
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Granted: 1988-08-09
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Expires: 2006-05-15
Abstract
Abstract An expandable ethylenic or styrenic polymer composition for production of lightly crosslinked foamed polymers and a process for controlling the degree of crosslinking of the polymer prior to extrusion foaming. The control is obtained by use of (a) a reversible gas-yielding crosslinking reaction which is delayed in the foam extrusion line in the presence of gaseous products (alcohols) and (b) added amounts of an alcohol such as an aliphatic alcohol. Suitable crosslinking agents include silanes, azido functional silanes, titanates, and amino compounds.
Inventors
- 👤 Chung P. Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:02
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/05; C08J; C08J9/00; C08J9/0014; C08J9/0023; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J9/144; C08K5/0008; C08K5/0025
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
78 words
An expandable ethylene or styrene polymer composition comprising an ethylene or styrene polymer, a blowing agent, a crosslinking agent is selected from the group consisting of silane, azido silane, titanate and amino compounds which upon reaction with said ethylene or styrene polymer reversibly releases alcohol, and a sufficient amount of alcohol to control the degree of crosslinking of said ethylene or styrene polymer prior to activation of said blowing agent and foaming of said ethylene or styrene polymer.
Claim 2
Dependent Claim
78 words
An expandable ethylene or styrene polymer composition comprising an ethylene or styrene polymer, a blowing agent, a crosslinking agent is selected from the group consisting of silane, azido silane, titanate and amino compounds which upon reaction with said ethylene or styrene polymer reversibly releases alcohol, and a sufficient amount of alcohol to control the degree of crosslinking of said ethylene or styrene polymer prior to activation of said blowing agent and foaming of said ethylene or styrene polymer.
Claim 3
Dependent Claim
23 words
The composition of claim 1 wherein said crosslinking agent is selected from the group consisting of silane, azido silane, titanate and amino compounds.
Claim 4
Dependent Claim
40 words
The composition of claim 2 wherein said ethylene or styrene polymer material is selected from the group consisting of linear low density polyethylene, high density polyethylene, polypropylene polystyrene, styrene/acrylic acid copolymers, ethylene/acrylic acid copolymers, styrene/acrylonitrile/hydroxy ethylacrylate terpolymers, and mixtures thereof.
Claim 5
Dependent Claim
24 words
The composition of claim 3 wherein said alcohol is an aliphatic alcohol selected from the group consisting of methanol, ethanol, n-propanol, i-propanol, and butanol.
Claim 6
Dependent Claim
22 words
The composition of claim 4 wherein said blowing agent is selected from the group consisting of dichlorodifluoromethane, trichloromonofluoromethane, dichlorotetrafluoroethane and mixtures thereof.
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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) | 1991-08-09 | 1992-02-08 | 1992-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-09 | 1996-02-08 | 1996-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-09 | 2000-02-08 | 2000-08-09 | $7700.00 | Window Closed / Lapsed |