Patent US4439388A successfully refreshed from Google Patents.
US4439388A
Expired / Lapsed
US
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Process for crosslinking of polymers and copolymers using free radical forming agents
Assignee: Luperox GmbH
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Filing: 1982-08-03
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Granted: 1984-03-27
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Expires: 2002-08-03
Abstract
Abstract Crosslinkable polymers and co-polymers are treated with boric acid, boric acid anhydride, or mixtures thereof prior to crosslinking with free radical organic peroxide initiators in the presence of oxygen. This pre-treatment prevents stickiness of the surface of the crosslinked polymer making the crosslinked polymer more commercially acceptable.
Inventors
- 👤 Jurgen Groepper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:42
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/124; C08G; C08G18/00; C08G18/06; C08G18/83; C08G18/838; C08K; C08K3/00; C08K3/38; C08J2321/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
83 words
A process for the crosslinking of crosslinkable polymers or copolymers comprising molding the crosslinkable polymers or copolymers into the desired shaped articles, pretreating the shaped articles in order to prevent the surfaces from being sticky by coating on the shaped articles a member selected from the group consisting of boric acid, boric acid anhydride, and mixtures thereof, and crosslinking the coated shaped articles with free radical initators of organic peroxides in the presence of oxygen wherein the crosslinked shaped articles have non-sticky surfaces.
Claim 2
Dependent Claim
83 words
A process for the crosslinking of crosslinkable polymers or copolymers comprising molding the crosslinkable polymers or copolymers into the desired shaped articles, pretreating the shaped articles in order to prevent the surfaces from being sticky by coating on the shaped articles a member selected from the group consisting of boric acid, boric acid anhydride, and mixtures thereof, and crosslinking the coated shaped articles with free radical initators of organic peroxides in the presence of oxygen wherein the crosslinked shaped articles have non-sticky surfaces.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein the boric acid, boric acid anhydride and mixtures thereof are blown, painted, or dusted onto the molded articles as a powder.
References Cited (Backward Citations)
US4359492A
Cited
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 |