Polyolefin-Based Hot Melt Adhesives With Improved Processing And Bonding Performance

Patent metadata

Field	Value
Publication number	US-2016102230-A1
Application number	US-201514882242-A
Country	US
Kind code	A1
Filing date	Oct 13, 2015
Priority date	Oct 13, 2014
Publication date	Apr 14, 2016
Grant date	—

Abstract

A hot melt adhesive made from a blend of a polypropylene-based polymer, a polyolefin elastomer, and an amorphous polyolefin. These adhesives exhibit excellent molten and pre-set flow allowing them to wet out substrates yet develop properties needed to form and maintain strong bonds making them useful for hygiene, construction, and packaging applications.

First claim

What is claimed is:

1 . A hot melt adhesive, comprising:
(a) about 1% to about 30% by weight of a polypropylene random copolymer, or a polypropylene impact copolymer, or mixtures thereof; (b) about 2% to about 60% by weight of a polyolefin elastomer, or mixtures thereof; (c) about 1% to about 40% by weight of an amorphous polyolefin; (d) about 5% to about 70% by weight of a tackifying resin; (e) 0% to about 60% by weight of a plasticizer; (f) 0% to about 5% of a stabilizer or antioxidant; wherein the components total 100% by weight of the composition, and the viscosity of the composition is equal to or less than about 40,000 cP at 163° C.

2 . The hot melt adhesive of claim 1 wherein the viscosity of the composition is equal to or less than 20,000 cP at 163° C.

3 . The hot melt adhesive of claim 1 wherein the viscosity of the composition is equal to or less than 10,000 cP at 163° C.

4 . The hot melt adhesive of claim 1 comprising about 2% to about 20% by weight of a polypropylene random copolymer or polypropylene impact copolymer.

5 . The hot melt adhesive of claim 1 comprising about 5% to about 50% by weight of a polyolefin elastomer or mixtures thereof.

6 . The hot melt adhesive of claim 1 comprising about 10% to about 40% by weight of a polyolefin elastomer or mixtures thereof.

7 . The hot melt adhesive of claim 1 comprising about 2% to about 20% by weight of an amorphous polyolefin or mixtures thereof.

8 . The hot melt adhesive of claim 1 comprising about 10% to about 60% by weight of a tackifying resin or mixtures thereof.

9 . The hot melt adhesive of claim 1 comprising about 20% to about 55% by weight of a tackifying resin or mixtures thereof.

10 . The hot melt adhesive of claim 1 comprising about 1% to about 60% by weight of a plasticizer or mixtures thereof.

11 . The hot melt adhesive of claim 1 comprising about 5% to about 50% by weight of a plasticizer or mixtures thereof.

12 . The hot melt adhesive of claim 1 wherein said polypropylene random copolymer or said polypropylene impact copolymer has a melt point range of about 130° C. to about 165° C., a melt enthalpy of from about 50 Joules/gram to about 100 Joules/gram, and a melt flow rate of about 0.5 grams/10 min to about 1000 grams/10 min.

13 . The hot melt adhesive of claim 1 wherein said olefin elastomer has a melt point of about 75° C. to about 80° C. and a melt enthalpy of less than about 25 Joules/gram.

14 . The hot melt adhesive of claim 13 wherein said olefin elastomer comprises a metallocene catalyzed polypropylene homopolymer having a density of about 0.87 g/cc.

15 . The hot melt adhesive of claim 1 wherein said amorphous polyolefin comprises a homopolymer of propylene or a copolymer of propylene with one or more alpha-olefin comonomer.

16 . The hot melt adhesive of claim 15 wherein said alpha-olefin comonomer is ethylene, butene-1, hexene-1 or octene-1.

17 . A hot melt adhesive, comprising:
(a) about 8% to about 12% by weight of a polypropylene random copolymer, or mixtures thereof; (b) about 22% to about 28% by weight of a low melting point metallocene catalyzed polypropylene homopolymer elastomer having a density of about 0.87 g/cc, or mixtures thereof; (c) about 10% to about 15% by weight of an amorphous polyalphaolefin; (d) about 21% to about 27% by weight of ahydrocarbon tackifying resin; (e) about 24% to about 29% by weight of a mineral oil plasticizer; (f) 0% to about 5% of a stabilizer or antioxidant; wherein the components total 100% by weight of the composition, and the viscosity of the composition is equal to or less than about 10,000 cP at 163° C.

18 . The hot melt adhesive of claim 17 wherein said polypropylene random copolymer has a melt point range of about 130° C. to about 165° C., a melt enthalpy of from about 50 Joules/gram to about 100 Joules/gram, and a melt flow rate of about 0.5 grams/10 min to about 1000 grams/10 min.

19 . The hot melt adhesive of claim 17 wherein said polypropylene homopolymer elastomer has a melt point of about 75° C. to about 80° C. and a melt enthalpy of less than about 25 Joules/gram.

20 . The hot melt adhesive of claim 17 wherein said amorphous polyalphaolefin comprises a homopolymer of propylene or a copolymer of propylene with one or more alpha-olefin comonomer, said alpha-olefin comonomer comprising ethylene, butene-1, hexene-1 or octene-1.

Assignees

• Bostik Inc

Inventors

• Gray Steven Daniel
• Freund David Frederic
• Hamann Richard Edward
• Hu Miao
• Flores Fabrice Nicolas-Henri

Classifications

• C09J123/12 Primary

  Polypropene · CPC title

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C09J123/142

  at least partially crystalline copolymers of propene with other olefins · CPC title

• C09J11/08

  Macromolecular additives · CPC title

• C09J11/06

  organic · CPC title