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High opacity paper containing expanded fiber and mineral pigment

  • US 4,952,278 A
  • Filed: 06/02/1989
  • Issued: 08/28/1990
  • Est. Priority Date: 06/02/1989
  • Status: Expired due to Fees
First Claim
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1. An opacified paper structure comprising cellulosic fibers, from about 1% to about 25% expanded cellulosic fibers, based on the dry weight of said opacified paper structure, and an effective amount of an opacifying mineral pigment, said paper having a basis weight from about 20 to about 120 grams per square meter, and a density of about 1.0 grams or less per cubic centimeter.

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