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US 8,912,266 B2Granted
Thermoplastic elastomers exhibiting superior barrier properties
AssigneePolyOne Corporation
InventorsGuoqiang Qian, Liang Xu, Krishna Venkataswamy
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Abstract
A blend of styrene-isobutylene-styrene based thermoplastic elastomer and organoclay-filled polyamide is disclosed which has good processability and more effective barrier properties for oxygen than the blend using amorphous or crystalline polyamide without organoclay.
Claims15
A thermoplastic elastomer compound comprising:
- (a) from about 70 to about 85 weight percent of styrene-isobutylene-styrene thermoplastic elastomer;
- and
- (b) from about 15 to about 30 weight percent of polyamide including organoclay dispersed in the polyamide;
- wherein the compound has flexibility and oxygen barrier properties such that:
- (A) when the compound comprises about 85 weight percent of styrene-isobutylene-styrene thermoplastic elastomer and about 15 weight percent of polyamide including organoclay dispersed in the polyamide, the compound has:
- (i) Shore A hardness (ASTM D2240, 10 seconds delay) of 68;
- (ii) Percent Elongation (ASTM D412, Die C) of 292;
- and
- (iii) Oxygen Transmission Rate (ASTM D3985 cc·mil/m2·day) of 570;
- and
- (B) when the compound comprises about 70 weight percent of styrene-isobutylene-styrene thermoplastic elastomer and about 30 weight percent of polyamide including organoclay dispersed in the polyamide, the compound has:
- (i) Shore A hardness (ASTM D2240, 10 seconds delay) of 89;
- (ii) Percent Elongation (ASTM D412, Die C) of 83;
- and
- (iii) Oxygen Transmission Rate (ASTM D3985 cc·mil/m2·day) of 55.
12 more elements
A molded article formed from a thermoplastic elastomer compound comprising:
- (a) from about 70 to about 85 weight percent of styrene-isobutylene-styrene thermoplastic elastomer;
- and
- (b) from about 15 to about 30 weight percent of polyamide including organoclay dispersed in the polyamide;
- wherein the molded article has flexibility and oxygen barrier properties such that:
- (A) when the compound comprises about 85 weight percent of styrene-isobutylene-styrene thermoplastic elastomer and about 15 weight percent of polyamide including organoclay dispersed in the polyamide, the molded article has:
- (i) Shore A hardness (ASTM D2240, 10 seconds delay) of 68;
- (ii) Percent Elongation (ASTM D412, Die C) of 292;
- and
- (iii) Oxygen Transmission Rate (ASTM D3985 cc·mil/m2·day) of 570;
- and
- (B) when the compound comprises about 70 weight percent of styrene-isobutylene-styrene thermoplastic elastomer and about 30 weight percent of polyamide including organoclay dispersed in the polyamide, the molded article has:
- (i) Shore A hardness (ASTM D2240, 10 seconds delay) of 89;
- (ii) Percent Elongation (ASTM D412, Die C) of 83;
- and
- (iii) Oxygen Transmission Rate (ASTM D3985 cc·mil/m2·day) of 55.
12 more elements
Dependencies are inferred from the claim text.