US 5,478,629 A · Polymeric sheets and laminas having high flexural durability

Abstract

Polymeric blends suitable for making plastic sheets and laminas which exhibit improved flexural durability while retaining stiffness and impact strength include a core made from a blend comprising polyvinyl chloride resin, a vinyl chloride-vinyl ester copolymer, one or more acrylic polymers or copolymers, a chlorinated polyolefin, a solid tin stabilizer, and one or more ester waxes. The lamina, which is suitable for use as an extended life credit card, is prepared by forming a polymeric blend of a core material into a base layer sheet material which is subsequently treated to reduce surface tension and improve ink adhesion thereto, then printed with desired indicia, and finally provided with a contact-transparent protective overlay which is laminated thereto. The protective layer is a sheet material made from either a polymer or copolymer such as polyvinyl fluoride, or a polymer blend comprising essentially the same components of the core material but utilizing a different tin stabilizer and including the use as an ultra-violet light stabilizer. The overlay polymer blend material is very compatible with the core material and has good flex life.

Claims10

Dependent claims

In a laminated article comprising a thermoplastic core having ink and/or dye on at least one surface thereof and at least one thermoplastic transparent overlay bound to said core, the improvement wherein said core comprises a blend of;

a resin which is a polyvinyl chloride polymer or copolymer containing at least 70 percent vinyl chloride repeat units therein;
from about 50 to about 200 parts by weight per 100 parts by weight of said resin of a copolymer of vinyl chloride and a vinyl ester wherein the ester group contains from 2 to 5 carbon atoms;
from about 25 to about 60 parts by weight per 100 parts by weight of said resin of one or more acrylic polymers, or copolymers, or blends thereof;
from about 10 to about 100 parts by weight per 100 parts by weight of said resin of a chlorinated polyolefin wherein the repeat unit of said polyolefin has from 2 to 4 carbon atoms;
from about 0.5 to about 10 parts by weight per 100 parts by weight of said resin of one or more solid alkyl tin stabilizers,
and from about 0.5 to about 10 parts by weight per 100 parts by weight of said resin of one or more ester waxes.

3 more elements

A transparent flexible polymeric overlay, comprising:

a thermoplastic sheet of a polymeric blend of:
a resin which is a polyvinyl chloride polymer or copolymer containing at least 70 percent vinyl chloride repeat units therein;
from about 10 to about 100 parts by weight per 100 parts by weight of said resin of a copolymer of vinyl chloride and a vinyl ester wherein the ester group contains from 2 to 5 carbon atoms;
from about 5 to about 30 parts by weight per 100 parts by weight of said resin of one or more acrylic polymers, or copolymers, or blends thereof;
from about 10 to about 30 parts by weight per 100 parts by weight of said resin of a chlorinated polyolefin wherein the repeat unit of said polyolefin has from 2 to 4 carbon atoms;
from about 0.5 to about 12 parts by weight per 100 parts by weight of said resin of one or more alkyl tin stabilizers,
from about 0.5 to about 5 parts by weight per 100 parts by weight of said resin of one or more ester waxes,
and from about 0.1 to about 1.5 parts by weight per 100 parts by weight of said resin of one or more ultraviolet light stabilizers,
said sheet having an average machine direction--transverse direction flex life of at least 6,000 flexes.

6 more elements

Dependencies are inferred from the claim text.

Polymeric sheets and laminas having high flexural durability

Life of this patent

Polymeric sheets and laminas having high flexural durability

Life of this patent

Abstract

Claims10