Elastic blends of semicrystalline propylene polymers and high glass transition temperature materials
AssigneeExxonMobil Chemical Patents Inc.
InventorsChristopher L. Curry, Sudhin Datta
Life of this patent
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Abstract
Compositions are provided having from 70 wt % to 95 wt % of a polymer selected from homopolymers and random copolymers of propylene and from 5 wt % to 30 wt % of a miscible hydrocarbon resin with a glass transition temperature greater than 20° C. The polymer has a heat of fusion of less than 50 J/g, a melt index (MI) of less than 20 dg/min, and contains stereoregular propylene crystallinity. Also provided are films containing such compositions, and articles, such as diapers or incontinence garments, including such films.
Claims54
A composition comprising:
- (a) from 70% to 95% by weight based on the total weight of the composition of a polymer selected from the group consisting of homopolymers and random copolymers of propylene, the polymer having a heat of fusion as determined by DSC of less than 50 J/g and a melt index (MI) of less than 20 dg/min, and containing stereoregular propylene crystallinity;
- and
- (b) from 5% to 30% by weight based on the total weight of the composition of a miscible hydrocarbon resin having a glass transition temperature greater than 20° C. wherein the hydrocarbon resin has a softening point of from 80° C. to 180° C.
A composition comprising:
- (a) a polymer selected from the group consisting of homopolymers and random copolymers of propylene, wherein the polymer has a heat of fusion as determined by DSC of less than 50 J/g, a melt index (MI) of less than 5 dg/min, and contains stereoregular propylene crystallinity;
- and
- (b) a miscible hydrocarbon resin having a glass transition temperature greater than 200° C. wherein the hydrocarbon resin has a softening point of from 80° C. to 180° C.
An elastic film comprising a composition, the composition comprising:
- (a) a polymer selected from the group consisting of homopolymers and random copolymers of propylene, wherein the polymer has a heat of fusion as determined by DSC of from 1 J/g to 50 J/g, a melt index (MI) of less than 7 dg/min, and contains stereoregular propylene crystallinity;
- and
- (b) a miscible hydrocarbon resin with a glass transition temperature greater than 20° C. wherein the hydrocarbon resin has a softening point of from 80° C. to 180° C.
Dependencies are inferred from the claim text.