Wetness indicating hot-melt adhesives
AssigneeMalcolm Nicol & Co.
InventorsHerman Colon, Albery Maletsky
Life of this patent
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Abstract
A wetness indicating hot-melt adhesive which changes color in response to the presence of moisture is disclosed, which contains 20 to 70 wt. % of polymer, about 28 to 10 wt. % of which is water sensitive polymer; 25 to 60% of organic acid which is selected from a high acid fatty acid, or rosin acid, or a combination thereof; 0 to 40% of water soluble wax; 0 to 60 wt. % of glycerlo monostearate; 0 to 55 wt. % of hydrogenated castor oil; 0 to 15 wt. % of polyalkylene wax; 0 to 60 wt. % of compatible plasticizer; and a wetness indicating agent which changes the color of the composition in response to moisture therein. The time of response of the color change can be controlled from about one second to a somewhat larger value as desired.
Claims45
A wetness indicating hot-melt adhesive composition comprising:
- (A) 20 to 70 wt.% of total polymer components, said polymer components comprising about 28 to 100 wt.% of water sensitive polymer selected from vinyl pyrrolidone homopolymer, vinyl pyrrolidone/vinyl acetate copolymer, or a mixture thereof, any balance comprising at least one polymer selected from the group consisting of ethylene/vinyl acetate copolymer, ethylene/acrylic acid copolymer and polyamide;
- (B) 25 to 60 wt. % of an acidic composition selected from the group consisting of
- (a) at least one free monobasic saturated or unsaturated fatty acid having an acid number above 137,
- (b) at least one rosin acid having an acid number above 130, and
- (c) a combination of said free monobasic saturated or unsaturated fatty acid and said rosin acid;
- (C) 0 to 40 wt.% of water soluble wax;
- (D) 0 to 60 wt.% of glycerol monostearate;
- (E) 0 to 55 wt.% of hydrogenated castor oil;
- (F) 0 to 15 wt.% of polyalkylene wax;
- (G) 0 to 60 wt.% of compatible plasticizer;
- and
- (H) a wetness indicating agent capable of causing the composition to change color in response to the presence of moisture, in an amount effective to provide the composition with a readily visible color when wet, which is distinct from the color when dry.
A wetness indicating hot-melt adhesive composition comprising:
- (A) 20 to 70 wt.% of total polymer components, said polymer components being selected from
- (a) about 22 to 100 wt.% water sensitive polymer selected from vinyl pyrrolidone homopolymer, vinyl pyrrolidone/vinyl acetate copolymer, or a mixture thereof, and 78 to 0 wt.% of ethylene/acrylic acid copolymer,
- (b) about 28 to 100 wt.% of water sensitive polymer selected from vinyl pyrrolidone homopolymer, vinyl pyrrolidone/vinyl acetate copolymer, or a mixture thereof, and 72 to 0 wt.% of ethylene/vinyl acetate copolymer, and
- (c) about 28 to 100 wt.% of water sensitive polymer selected from vinyl pyrrolidone homopolymer, vinyl pyrrolidone/vinyl acetate copolymer, or a mixture thereof, and 72 to 0 wt.% of polyamide;
- (B) 25 to 60 wt.% of an acidic composition selected from the group consisting of
- (a) at least one free monobasic saturated or unsaturated fatty acid having an acid number above 137,
- (b) at least one rosin acid having an acid number above 130, and
- (c) a combination of said free monobasic saturated or unsaturated fatty acid and said rosin acid;
- (C) 0 to 40 wt.% of water soluble wax;
- (D) 0 to 60 wt.% of glycerol monostearate;
- (E) 0 to 55 wt.% of hydrogenated castor oil;
- (F) 0 to 15 wt.% of polyalkylene wax;
- (G) 0 to 55 wt.% of compatible plasticizer;
- and
- (H) a wetness indicating agent capable of causing the composition to change color in response to the presence of moisture, in an amount effective to provide the composition with a readily visible color when wet, which is distinct from the color when dry.
Dependencies are inferred from the claim text.