E.i. Dupont De Nemours and Company

Dupont Canada Inc.

Michael A Hamilton

Thomas Edward Benim

Vaclay G Zboril

A process is provided for preparing an elastic film of a specific elastomeric composition which is formed by melt blending two particular elastomers, each of which is composed of hard and soft segments made from poly(tetramethylene ether)glycol, 1,4-butane diol and a phenylene dicarboxylic acid or a derivative thereof. One of the elastomers has an inorganic anti-blocking agent compounded in it. The process includes the steps of melt blending, melt extrusion, quenching and providing a draw-down of 12 to 40 to form a film which is particularly suited for use as elastic leg-strips in diapers.

Process for making polyetherester elastomer film

A specific elastomeric composition is formed by melt blending two particular elastomers, each composed of hard and soft segments made from poly(tetra-methylene ether) glycol, 1,4-butane diol and a phenylene dicarboxylic acid or a derivative thereof. The blend exhibits a melting endotherm that extends from no lower than 120.degree. C. to no higher than 215.degree. C. with a melting peak in the range of 150.degree. to 175.degree. C. Films made from the composition are particularly suited for use as elastic leg-strips in diapers.

Polyetherester elastomer composition

A solution process for the preparation of high molecular weight homopolymers of ethylene and copolymers of ethylene and C.sub.3 -C.sub.12 .alpha.-olefins is disclosed. The process involves feeding monomer, a particular coordination catalyst and hydrocarbon solvent to a reactor, polymerizing the monomer at a temperature of 105.degree.-320.degree. C. and recovering the polymer. The catalyst is obtained by combining solutions of titanium tetrahalide and of organoaluminum compound at a temperature of less than 30.degree. C., heating the resulting admixture to a temperature of 150.degree.-300.degree. C. for a period of 10 seconds to 10 minutes and combining the thus heat-treated mixture with a solution of an organoaluminum compound. The catalyst thus obtained is fed to the process, without separation of any components of the catalyst. In an embodiment part of the titanium tetrahalide may be replaced with vanadium oxytrihalide.

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Kingston, Canada

Michael A Hamilton