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US 4,058,648 AGranted
Dense paper
OwnerWilliam G. Loudeninventor
Life of this patent
Estimating the term…
Abstract
A dense paper comprising a web of cellulosic fibers and an impregnant dispersed throughout the web, the impregnant consisting essentially of a blend of a rigid polymeric material and an inorganic filler, in stated proportions, with the impregnant constituting a minor portion of the finished weight of the paper. A process for producing the paper is disclosed.
Claims13
A dense paper, comprising:
- a web of cellulosic fibers having an impregnant dispersed throughout the web, said web having a pre-impregnation density in a range of 7-11 lbs./mil and containing after impregnation from about 8.5 to about 50%, by weight, of the impregnant, based on the dry weight of the impregnated web, and said impregnant consisting essentially of from about 35 to about 90% of a rigid polymeric material and from about 10 to about 65% of an inorganic filler, said polymeric material having a glass transition temperature in a range of between about 15.degree. to about 60.degree. C, and said percentages of polymeric material and filler being by weight based on the weight of said impregnant.
A dense paper, comprising:
- a web and a blend dispersed throughout the web, said blend including a rigid polymeric material having a glass transition temperature in a range of about 15.degree. to about 60.degree. C and a compatible filler, the weight of the blend in the web being in a range of about 8.5 to about 50% of the finished dry weight of the paper, said blend consisting essentially of from about 35 to about 90% of said rigid polymeric material and from about 10% to about 65% of said compatible filler, said paper having a finished uncalendered density in a range of about 10.5 lbs./mil to about 14.0 lbs./mil, said percentages of polymeric material and filler being by weight based on the weight of the blend in the web.
A dense paper, comprising:
- a web having a blend of a rigid polymeric material and a compatible filler dispersed therein, said blend being in a range of between about 8.5% to about 50% by weight, based on the dry finished weight of the paper, said blend having been distributed in the paper by impregnation of a cellulosic fiber web having a pre-impregnation density in a range of about 7 to about 11 lbs./mil, said blend consisting essentially of from about 35 to about 90% of said rigid polymeric material and from about 10 to about 65% of said compatible filler, said percentages of said rigid polymeric material and said filler being by weight based on the weight of the blend in the web.
A dense paper, comprising:
- an impregnated cellulosic fiber web having a pre-impregnation density in a range of about 7 to about 11 lbs./mil and containing an impregnant consisting essentially of a rigid polymeric material having a glass transition temperature in a range of about 22.degree. to about 44.degree. C blended with a compatible filler, said impregnant constituting between about 15 to about 40% of the dry finished weight of the paper, and said impregnant consisting essentially of from about 20 to about 65% of said filler based on the weight of the impregnant.
A dense paper, comprising:
- a cellulosic fiber web and a blend dispersed in the web, said blend consisting essentially of a rigid polymeric material having a glass transition temperature in a range of about 22.degree. to about 44.degree. C and an inorganic filler, the weight of the blend in the web being in a range of about 10 to about 25% of the finished dry weight on the paper, said rigid polymeric material in said blend constituting between about 80 to about 40% of the weight of the blend in the web, and said paper having a finished uncalendered density in a range of about 10.5 to about 14 lbs./mil.
Dependencies are inferred from the claim text.