초록 ▼

Soft and low-density foam materials, obtained by means of an extrusion expansion (with physical blowing agents) of particular copolymers of ethylene with vinylacetate (and/or with alkyl esters of acrylic or methacrylic acid), are found to be very suitable for the manufacture of expanded articles wit

Soft and low-density foam materials, obtained by means of an extrusion expansion (with physical blowing agents) of particular copolymers of ethylene with vinylacetate (and/or with alkyl esters of acrylic or methacrylic acid), are found to be very suitable for the manufacture of expanded articles with little shrinkage after expansion, free from creases on the surface or cracks on the cell walls, and having excellent characteristics, higher compressive strength and so on.

대표청구항 ▼

A process for the manufacturer of soft and low-density non-crosslinked foam materials which comprises the steps of: (a) heating a starting copolymer of ethylene with vinylacetate and/or alkyl ester of acrylic or methacrylic acid, having a M.F.I. equal to or greater than 1, as well as a density rangi

A process for the manufacturer of soft and low-density non-crosslinked foam materials which comprises the steps of: (a) heating a starting copolymer of ethylene with vinylacetate and/or alkyl ester of acrylic or methacrylic acid, having a M.F.I. equal to or greater than 1, as well as a density ranging between about 0.92 to 0.95 g/cm3, which is contacted with a free radical initiator at a temperature of from 120°to 200°C. in an amount from about 0.05 to 0.50% by weight and (b) injecting into the thus-obtained polymer a physical blowing agent, thereafter foaming said polymer.