Elastomeric shaped article and method for preparing the same
First Claim
1. In a process for extrusion molding an elastomeric blockcopolyetherester comprised of from about 5% to 80% by weight of polyether soft segment and about 95% to 20% by weight of a polyester hard segment, said polyether soft segment being poly(butylene oxide) having an average molecular weight of about 300 to 6,000 and more than about 40 mol. % of said polyester hard segment being poly(butylene terephthalate), the improvement which comprises the steps of mixing about 0.1 to 10 parts by weight of poly(butylene terephthalate) with about 100 parts by weight of a blockcopolyetherester at a temperature above about 200°
- C., whereby fine fragments of poly(butylene terephthalate), maintained in a crystalline phase, are dispersed in the matrix of the blockcopolyetherester, and then extrusion molding the mixture at a temperature below the melting point of the poly(butylene terephthalate).
1 Assignment
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Accused Products
Abstract
An improved shaped article can be prepared from a blockcopolyetherester by (a) mixing the same with poly(butylene terephthalate) at a temperature of about 200° to about 230° C. whereby fine fragments of poly(butylene terephthalate) which maintains its own crystalline phase are dispersed in the matrix of the blockcopolyetherester, and (b) molding the mixture at a temperature below the melting point of the poly (butylene terephthalate). The addition of an ester wax and/or a calcium soap improves the extrusion-moldability of the mixture.
40 Citations
7 Claims
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1. In a process for extrusion molding an elastomeric blockcopolyetherester comprised of from about 5% to 80% by weight of polyether soft segment and about 95% to 20% by weight of a polyester hard segment, said polyether soft segment being poly(butylene oxide) having an average molecular weight of about 300 to 6,000 and more than about 40 mol. % of said polyester hard segment being poly(butylene terephthalate), the improvement which comprises the steps of mixing about 0.1 to 10 parts by weight of poly(butylene terephthalate) with about 100 parts by weight of a blockcopolyetherester at a temperature above about 200°
- C., whereby fine fragments of poly(butylene terephthalate), maintained in a crystalline phase, are dispersed in the matrix of the blockcopolyetherester, and then extrusion molding the mixture at a temperature below the melting point of the poly(butylene terephthalate).
- View Dependent Claims (2, 3, 4, 5, 6)
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7. In a process for extrusion molding an elastomeric blockcopolyetherester comprised of from about 5% to 80% by weight of a polyether soft segment and about 95% to 20% by weight of a polyester hard segment, said polyether soft segment being poly(butylene oxide) having an average molecular weight of about 300 to 6,000 and more than about 40 mol. % of said polyester hard segment being poly(butylene terephthalate), the improvement which comprises the steps of mixing about 0.1 to 10 parts by weight of poly(butylene terephthalate) and about 0.05 to 5.0 parts by weight of at least one member selected from the group consisting of ester waxes and calcium soaps with about 100 parts by weight of a blockcopolyetherester at a temperature of above 200°
- C., whereby fine fragments of poly(butylene terephthalate), maintained in a crystalline phase, are dispersed in the matrix of the blockcopolyetherester, and then extrusion molding the mixture at a temperature below the melting point of the poly(butylene terephthalate).
Specification