Water-dispersible pressure-sensitive adhesive, tape made therewith, and novel tackifiers therefor

Claim 2

NORMALLY TACKY AND PRESSURE-SENSITIVE WATER-DISPERSIBLE ADHESIVE COMPRISING: A. A COPOLYMER OF MONOMERS CONSISTING ESSENTIALLY OF

Claim 3

ABOUT 90-20 PARTS BY WEIGHT MONOMERIC ACRYLIC ACID ESTER OF NON-TERTIARY ALKYL ALCOHOL THE MOLECULES OF WHICH HAVE 1 TO 4 CARBON ATOMS; AND

Claim 4

ABOUT 90-20 PARTS BY WEIGHT MONOMERIC ACRYLIC ACID ESTER OF NON-TERTIARY ALKYL ALCOHOL THE MOLECULES OF WHICH HAVE 1 TO 4 CARBON ATOMS; AND

Claim 5

ABOUT 10-80 PARTS BY WEIGHT VINYL CARBOXYLIC ACID MONOMER COPOLYMERIZABLE WITH SAID ACRYLIC ACID ESTER, AT LEAST A NUMBER OF THE CARBOXYL GROUPS IN SAID ACID MONOMERS SUFFICIENT TO CONSTITUTE ABOUT 3-22% THE WEIGHT OF SAID COPOLYMER, HAVING BEEN NEUTRALIZED BY REACTION WITH A SECONDARY OR TERTIARY ALKANOLAMINE CONTAINING AT LEAST 4 CARBON ATOMS; AND B. 0-400 PARTS BY WEIGHT, SUFFICIENT TO RENDER SAID ADHESIVE WATER-DISPERSIBLE AND TO IMPART THERETO A ROLLING BALL TACK VALUE OF NO MORE THAN 20 INCHES, OF AT LEAST ONE WATERDISPERSIBLE TACK-PROMOTING MATERIAL SELECTED FROM THE CLASS CONSISTING OF THE OILY PLASTICIZING WATER-SOLUBLE POLYOXYETHYLENE COMPOUNDS AND THE TACKIGYING REACTION PRODUCTS OF ACID ROSINS AND ALKANOLAMINES.

Claim 6

ABOUT 10-80 PARTS BY WEIGHT VINYL CARBOXYLIC ACID MONOMER COPOLYMERIZABLE WITH SAID ACRYLIC ACID ESTER, AT LEAST A NUMBER OF THE CARBOXYL GROUPS IN SAID ACID MONOMERS SUFFICIENT TO CONSTITUTE ABOUT 3-22% THE WEIGHT OF SAID COPOLYMER, HAVING BEEN NEUTRALIZED BY REACTION WITH A SECONDARY OR TERTIARY ALKANOLAMINE CONTAINING AT LEAST 4 CARBON ATOMS; AND B. 0-400 PARTS BY WEIGHT, SUFFICIENT TO RENDER SAID ADHESIVE WATER-DISPERSIBLE AND TO IMPART THERETO A ROLLING BALL TACK VALUE OF NO MORE THAN 20 INCHES, OF AT LEAST ONE WATERDISPERSIBLE TACK-PROMOTING MATERIAL SELECTED FROM THE CLASS CONSISTING OF THE OILY PLASTICIZING WATER-SOLUBLE POLYOXYETHYLENE COMPOUNDS AND THE TACKIGYING REACTION PRODUCTS OF ACID ROSINS AND ALKANOLAMINES.

Claim 7

about 10-80 parts by weight vinyl carboxylic acid monomer copolymerizable with said acrylic acid ester, at least a number of the carboxyl groups in said acid monomers sufficient to constitute about 3-22% the weight of said copolymer, having been neutralized by reaction with a secondary or tertiary alkanolamine containing at least 4 carbon atoms; and b. 0-400 parts by weight, sufficient to render said adhesive water-dispersible and to impart thereto a rolling ball tack value of no more than 20 inches, of at least one water-dispersible tack-promoting material selected from the class consisting Of the oily plasticizing water-soluble polyoxyethylene compounds and the tackifying reaction products of acid rosins and alkanolamines.

Claim 8

about 10-80 parts by weight vinyl carboxylic acid monomer copolymerizable with said acrylic acid ester, at least a number of the carboxyl groups in said acid monomers sufficient to constitute about 3-22% the weight of said copolymer, having been neutralized by reaction with a secondary or tertiary alkanolamine containing at least 4 carbon atoms; and b. 0-400 parts by weight, sufficient to render said adhesive water-dispersible and to impart thereto a rolling ball tack value of no more than 20 inches, of at least one water-dispersible tack-promoting material selected from the class consisting Of the oily plasticizing water-soluble polyoxyethylene compounds and the tackifying reaction products of acid rosins and alkanolamines.

Claim 9

The adhesive of claim 1 wherein the non-tertiary alcohol molecules from which the acrylic acid ester was derived contain an average of 4-12 carbon atoms, at least a major portion of said molecules having a carbon-to-carbon chain of at least 4 carbon atoms terminating at the hydroxyl carbon atoms, said chain containing at least one-half the total number of carbon atoms in the molecule, said acrylic acid ester being further characterized as per se polymerizable to a sticky, stretchy, and elastic polymer mass.

Claim 10

Normally tacky and pressure-sensitive adhesive sheet material comprising a self-sustaining sheet backing having coated over at least one face thereof the adhesive of claim 1.

Claim 11

Normally tacky and pressure-sensitive adhesive tape according to claim 3 wherein the alkyl alcohol consists essentially of iso-octyl alcohol and the carboxylic acid monomer consists essentially of acrylic acid.

Claim 12

The tape of claim 4 wherein the backing is a water-dispersible paper so as to provide a totally repulpable splicing tape having particular utility in the papermaking and printing industries.

Claim 13

The tape of claim 5 wherein the water-dispersible copolymer consists essentially of 75 to 50 weight percent iso-octyl acrylate and carboxylic acid monomer correspondingly consists essentially of 25 to 50 weight percent acrylic acid.

Claim 14

The tape of claim 6 wherein the tack-promoting material is a rosin which has been reacted with a sufficient amount of secondary or tertiary alkanolamine to be rendered water-dispersible.

Claim 15

The tape of claim 7 wherein the alkanolamine is tertiary.

Claim 16

The tape of claim 8 wherein about 100 parts by weight of the tackifier are employed.

Claim 17

The tape of claim 9 wherein the rosin has been reacted with methyldiethanolamine.

Claim 18

The tape of claim 3 wherein the copolymer consists essentially of 75:25 n-butyl acrylate:acrylic acid, about 25% of the acid function being neutralized.

Claim 19

The tape of claim 3 wherein the copolymer consists essentially of n-butyl acrylate and acrylic acid, essentially all of said acrylic acid being neutralized with a polyoxypropylene adduct of dimethyl amine.

Claim 20

The tape of claim 12 wherein the weight ratio of acrylate: acrylic acid is about 90:10.