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US 4,225,652 AGranted
Transparent sheet material
AssigneeMinnesota Mining and Manufacturing Company
InventorsElizabeth A. Mercer, John F. Eisele
Life of this patent
Estimating the term…
Abstract
Transparent sheet material comprising a transparent backing having an ink-receptive stratum thereon. The ink-receptive stratum comprises either a mixture of two polymers or individual layers of each polymer. One polymer is the reaction product of an epoxidized, water-insoluble, neutral rubbery polymer and a water-soluble secondary mono amine and the second polymer contains the repeating units ##STR1##
Claims10
A sheet material useful in preparing visual transparencies comprising
- (a) a thin backing which is transparent to visible light;
- and
- (b) a continuous ink-receptive stratum on one major surface of said backing wherein said stratum is transparent to visible light and employs (a) a first polymer that is water-soluble, rubbery, alkaline in aqueous solution and consists essentially of the reaction product of a water-soluble secondary mono amine and an epoxidized water-insoluble, neutral, rubbery polymer selected from cis-1,4-polybutadiene, butadiene:styrene copolymer, butadiene:acrylonitrile copolymer and cis-1,4-polyisoprene, and (b) a second polymer that has a weight average molecular weight of at least about 50,000 and contains the repeating units ##STR3## wherein the weight ratio of type I units to type II units in said second polymer is in the range of about 2:1 to 6:1;
- and wherein said ink-receptive stratum is selected from
- (i) a single layer comprising a mixture of from about 30% to 70% by weight of said first polymer and from about 70% to 30% by weight of said second polymer, and
- (ii) a multiple layer comprising a first continuous layer of said first polymer on said backing and a second continuous layer of said second polymer on said first continuous layer of first polymer.
3 more elements
Dependencies are inferred from the claim text.