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US 4,413,080 AGranted
Water-dispersible pressure-sensitive adhesive and tape made therewith
AssigneeMinnesota Mining and Manufacturing Company
InventorFrederick D. Blake
Life of this patent
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Abstract
Water-dispersible pressure-sensitive adhesive useful for splicing carbonless paper without deactivating its color-generating system. Certain acrylate:acrylic acid copolymers are blended with acidic rosin or rosin derivative, partially neutralized with KOH in combination with NaOH and/or LiOH, and plasticized with an oily water-soluble polyoxyethylene compound. Repulpable splicing tapes can be made with the adhesive.
Claims7
Normally tacky and pressure-sensitive water-dispersible adhesive comprising the blended reaction product of
- (a) 100 parts by weight of a copolymer of monomers consisting essentially of
- (1) about 75-85 weight percent of at least one monomeric acrylic acid ester of nontertiary alkyl alcohol, and, correspondingly,
- (2) about 25-15 weight percent of vinyl carboxylic acid,
- (b) about 35-100 parts by weight of acidic rosin or rosin derivative,
- (c) sufficient potassium hydroxide to neutralize about 30-45% of the combined carboxyl groups of the copolymer and rosin or rosin derivative,
- (d) sufficient sodium hydroxide, lithium hydroxide, or a combination of sodium and lithium hydroxide to neutralize about 20-45% of said carboxyl groups, and
- (e) about 100-225 parts by weight of oily plasticizing water-soluble polyoxyethylene compound.
4 more elements
Dependencies are inferred from the claim text.