SURFACE PROTECTIVE SHEET SUBSTRATE AND SURFACE PROTECTIVE SHEET
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United States of America Patent
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Aug 6, 2015
app pub date -
Feb 2, 2015
filing date -
Feb 5, 2014
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Abstract
Provided is a surface protective sheet substrate capable of forming a surface protective sheet endowed with both curling inhibition and adhesion mark inhibition. The surface protective sheet substrate provided by this invention comprises a polyolefin resin which accounts for more than 50% by weight of the entire substrate. The substrate comprises a layer X constituting a first surface of the substrate and a layer Y constituting the second surface of the substrate. The layer X is constituted with a resin composition having a tensile elastic modulus (EX) of 400 MPa or greater, but 750 MPa or less. The layer Y is constituted with a resin composition having a tensile elastic modulus (EY) of 400 MPa or greater, but 750 MPa or less. The layer X has a thickness tX and the layer Y has a thickness tY, satisfying 0.5≦tX·EX·tY·EY≦1.5.
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