Multilayer film and method for producing the same

摘要

A multilayer film (10) is provided with a hard coat layer (12) and a film base (11) formed from a polymer compound. A heat shrinkage factor of the film base (11) (170° C., 10 minutes) is in a range from 0.05% to 3.0%. The hard coat layer (12) is formed by applying a coating liquid (33) containing a compound represented by a general formula (1), tetraalkoxysilane, acid water with pH in a range from 2 to 6, and a water-soluble hardening agent. An amount of the acid water is in a range from 60 to 2000 pts. wt. relative to a total amount 100 pts. wt. of the compound represented by the general formula (1) and tetraalkoxysilane. In the general formula (1), “R1” is an organic group having 1 to 15 carbons and containing no amino group. “R2” is a methyl group or ethyl group, “R3” is an alkyl group having 1 to 3 carbons, and “n” is zero or 1. (1) R1R2nSi(OR3)3-n.

主权项

1. A multilayer film comprising:
a film base formed from a polymer compound, a heat shrinkage factor of said film base after being heated at 170° C. for 10 minutes being in a range from 0.05% to 3.0%; a hard coat layer formed by applying a water-based coating liquid onto said film base and drying said applied coating liquid, said coating liquid not containing an organic solvent but containing a water soluble hardening agent and alkoxysilane aqueous solution in which an organic silicon compound represented by a general formula (I) and tetraalkoxysilane are dissolved in an acid aqueous solution having a pH in a range from 2 to 6, said hardening agent promoting dehydrating condensation of silanol generated by hydrolysis of said organic silicon compound and said tetraalkoxysilane, an amount of said acid aqueous solution being in a range from 100 parts by weight to 1500 parts by weight where a total amount of said organic silicon compound and said tetraalkoxysilane is 100 parts by weight,
R1R2nSi(OR3)3-n  (1)wherein R1 is an organic group having 1 to 15 carbons and containing no amino group, and R2 is a methyl group or ethyl group, and R3 is an alkyl group having 1 to 3 carbons, and n is zero or 1.