Delustered thermally shrinkable film
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsTakeji Yanagisawa, Yasutoshi Soda
Life of this patent
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Abstract
Disclosed in a delustered, thermally shrinkable polyvinyl chloride film which is obtained by extruding and orienting a polyvinyl chloride resin composition in which the polyvinyl chloride is a mixture of (A) a partially crosslinked polyvinyl chloride resin and (B) a non-crosslinked polyvinyl chloride resin in an (A)/(B) weight ratio of from 15/85 to 80/20; and in which the average polymerization degree of tetrahydrofuran-soluble portion of the polyvinyl chloride resin (B) is greater than that of tetrahydrofuran-soluble portion of the polyvinyl chloride resin (A).
Claims13
A delustered, thermally shrinkable film made from a mixture of (A) a partially crosslinked polyvinyl chloride resin having a tetrahydrofuran-insoluble gel content of 10-35 wt. %, (B) a non-crosslinked polyvinyl chloride resin, and (C) 0 to 20 parts by weight of a plasticizer per 100 parts by weight of (A) plus (B), said mixture being mixed in an (A):(B) weight ratio of from 30:70 to 60:40, in which the average polymerization degree of tetrahydrofuran-soluble portion of the polyvinyl chloride resin (B) is 600-1100 and greater than that of tetrahydrofuran-soluble portion of the polyvinyl chloride resin (A) which is 400-1000, and wherein said film is delustered and thermally shrinkable.
A method of forming a delustered, thermally shrinkable film comprising extruding and orienting a mixture of (A) a partially crosslinked polyvinyl chloride resin having a tetrahydrofuran-insoluble gel content of 10-35 wt. %, (B) a non-crosslinked polyvinyl chloride resin, and (C) 0 to 20 parts by weight of a plasticizer per 100 parts by weight of (A) plus (B), said mixture being mixed in an (A):(B) weight ratio of from 30:70 to 60:40, in which the average polymerization degree of tetrahydrofuran-soluble portion of the polyvinyl chloride resin (B) is 600-1100 and greater than that of tetrahydrofuran-soluble portion of the polyvinyl chloride resin (A) which is 400-1000, whereby there is formed a delustered and thermally shrinkable film.
Dependencies are inferred from the claim text.