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US 2002/0086134 A1Published application
High-friction roll covering comprising a polymer blend
Assignee3M Innovative Properties Company
InventorsDennis G. Welygan, Louis S. Moren
Life of this patent
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Abstract
The present invention embodies covers, especially those used in the textile industry. Some covers are made of a polypropylene comprising less than 90 percent isotactic linkages and a thermoplastic block copolymer comprising hard segments of polystyrene combined with soft segments. Other covers are made of metallocene-catalyzed polyolefins and thermoplastic block copolymers. The durable-abrasion resistant covers typically have a high static coefficient of friction.
Claims15
A cover for a substrate surface, wherein the cover consists essentially of a blend of:
- a. homopolypropylene consisting of 50 to 90 percent isotactic linkages in the same polymer backbone;
- b. a thermoplastic block copolymer comprising hard segments of polystyrene combined with soft segments comprising 2 to 8 carbon atoms, the thermoplastic block copolymer having a Shore A hardness greater than about 30, wherein the blend is in the range of about 80 percent by weight of the homopolypropylene and about 20 percent by weight of the thermoplastic block copolymer to about 20 percent by weight of the homopolypropylene and about 80 percent by weight of the thermoplastic block copolymer;
- and
- c. optional additives selected from the group consisting of fillers, fibers, antistatic agents, lubricants, wetting agents, foaming agents, surfactants, pigments, dyes, coupling agents and plasticizers.
1 more element
A traction roll comprising:
- a. a roll having an outer cylindrical surface;
- and
- b. a roll cover adapted to be attached to the outer surface of the roll, wherein the roll cover consists essentially of a blend of
- (1) homopolypropylene consisting of 50 to 90 percent isotactic linkages in the same polymer backbone;
- (2) a thermoplastic block copolymer comprising hard segments of polystyrene combined with soft segments comprising 2 to 8 carbon atoms, the thermoplastic block copolymer having a Shore A hardness greater than about 30, wherein the blend is in the range of about 80 percent by weight of the homopolypropylene and about 20 percent by weight of the thermoplastic block copolymer to about 20 percent by weight of the homopolypropylene and about 80 percent by weight of the thermoplastic block copolymer;
- and
- (3) optional additives selected from the group consisting of fillers, fibers, antistatic agents, lubricants, wetting agents, foaming agents, surfactants, pigments, dyes, coupling agents and plasticizers.
4 more elements
Dependencies are inferred from the claim text.