Patent EP0184212A2 successfully refreshed from Google Patents.
EP0184212A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for cross-linking halogenated polymers
Assignee: Hercules LLC
•
Filing: 1985-12-05
•
Granted: —
•
Expires: 2005-12-05
Abstract
Abstract A cure system for halogen-containing polymers that comprises a thiourea derivative, a thiuram sulfide and an inorganic base yields stable cross-linked products with useful properties when incorporated into normal vulcanization procedures.
Inventors
- 👤 Dominic Andrew Berta
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 01:06
CPC Classifications
C; C08; C08K; C08K13/00; C08K13/02; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K5/00; C08K5/36; C08K5/39; C08K5/40; C08K5/405
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
A process comprising heating a halogen-containing polymer to a temperature sufficient to effect cross-linking in the presence of a cure system containing an aliphatic substituted thiourea, characterized in that the cure system further contains: (1) an inorganic base selected from the group consisting of a group Ia oxide, a group Ia hydroxide, a group Ia carbonate, a group IIa oxide, a group IIa hydroxide, and a group IIa carbonate, and (2) a thiuram sulfide selected fror. the group consisting of an alkylthiuram sulfide and an arylthiurai,t sulfide.
Claim 2
Dependent Claim
87 words
A process comprising heating a halogen-containing polymer to a temperature sufficient to effect cross-linking in the presence of a cure system containing an aliphatic substituted thiourea, characterized in that the cure system further contains: (1) an inorganic base selected from the group consisting of a group Ia oxide, a group Ia hydroxide, a group Ia carbonate, a group IIa oxide, a group IIa hydroxide, and a group IIa carbonate, and (2) a thiuram sulfide selected fror. the group consisting of an alkylthiuram sulfide and an arylthiurai,t sulfide.
Claim 3
Dependent Claim
15 words
The process of Claim 1, further characterized in that the inorganic base is magnesium oxide.
Claim 4
Dependent Claim
15 words
The process of Claim 1, further characterized in that the thiuram sulfide is tetramethylthylthiuram disulfide.
Claim 5
Dependent Claim
31 words
The process of Claim 1 further characterized in that the inorganic base is present in an amount from about 0.5% to about 5.0% based on the weight of the halogen-containing polymer.
Claim 6
Dependent Claim
31 words
The process of Claim 1 further characterized in that the thiuram sulfide is present in an amount from about 0.5% to about 10.0% based on the weight of the halogen-containing polymer.
Claim 7
Dependent Claim
17 words
The process of Claim 1, further characterized in that the halogen-containing polymer is an epichlorohydrin-ethylene oxide copolymer.
Claim 8
Dependent Claim
17 words
The process of Claim 1, further characterized in that the halogen-containing polymer is an epichlorohydrin-propylene oxide copolymer.
Claim 9
Dependent Claim
16 words
The process of Claim 1, further characterized in that the aliphatic substituted thiourea is ethylene thiourea.
Claim 10
Dependent Claim
11 words
The cross-linked halogen-containing polymers obtained by the processes of claims 1-8.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.