Low friction, abrasion resistant polymer coating
AssigneeExxon Chemical Patents Inc.
InventorsVirginia R. Cross, Cindy B. Shulman
Life of this patent
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Abstract
The invention relates to certain low friction abrasion resistant polymer coatings. The polymer coatings consist of thermoplastic materials based on blends of elastomers with high density polyethylene comprising a high molecular weight component. The appropriate balance of crystallinity, durability and flexibility can be achieved by selecting the proper amount of low, medium and high molecular weight high density polyethylene. The coating is particularly useful for weatherstripping material for automobile window channels.
Claims33
A low friction, abrasion resistant polymer coating composition comprising:
- (a) a high density polyethylene component comprising a blend of
- (i) high molecular weight, high density polyethylene;
- (ii) low molecular weight, high density polyethylene;
- and
- (iii) medium molecular weight, high density polyethylene;
- and
- (b) an elastomer component comprising a blend of ethylene/propylene rubber and high density polyethylene.
A low friction, abrasion resistant polymer coating composition comprising:
- (a) a high density polyethylene blend comprising:
- (i) a 10 to 80 percent by weight of high molecular weight high density polyethylene;
- (ii) 0 to 80 percent by weight of medium molecular weight high density polyethylene;
- (iii) 10 to 80 percent by weight of low molecular weight high density polyethylene and;
- (b) an elastomer component comprising a blend of 99 to 50 weight percent ethylene/propylene rubber and 1 to 50 weight percent high density polyethylene;
- wherein the ratio of said high density polyethylene component to said elastomer component ranges from 3:1 to 19:1.
The polymer coating composition defined in claim 52 wherein said ultraviolet resistant material is present in an amount ranging from about 1.0 to 10.0 weight percent.
A coated weather stripping material comprising:
- (a) a first layer comprising a rubbery polymer and
- (b) a second layer comprising a polymer coating composition, said polymer coating composition comprising:
- (i) a high density polyethylene component comprising
- (A) 20 to 80 weight percent high molecular weight high density polyethylene;
- (B) 0 to 80 weight percent medium molecular weight high density polyethylene;
- (C) 20 to 80 weight percent low molecular weight high density polyethylene;
- and
- (ii) an elastomer component comprising a blend of 99 to 50 weight percent ethylene/propylene rubber and 1 to 50 weight percent high density polyethylene;
- the ratio of said high density polyethylene component to said elastomer component ranging from 3:1 to 19:1.
Dependencies are inferred from the claim text.