Hot melt adhesive compositions that include semi-crystalline propylene polymer and wax and articles including the same

Patent metadata

Field	Value
Publication number	US-2016130480-A1
Application number	US-201514934789-A
Country	US
Kind code	A1
Filing date	Nov 6, 2015
Priority date	Nov 7, 2014
Publication date	May 12, 2016
Grant date	—

Abstract

A hot melt adhesive composition that includes at least 40% by weight of an unmodified, semi-crystalline propylene polymer that includes at least 50% by weight propylene, and at least 15% by weight wax.

First claim

What is claimed is:

1 . A hot melt adhesive composition comprising:
at least 40% by weight of an unmodified, semi-crystalline propylene polymer comprising at least 50% by weight propylene; at least 15% by weight non-functionalized wax, the non-functionalized wax comprising a first non-functionalized wax and a second non-functionalized wax different from the first non-functionalized wax; and no greater than 8% by weight of an ethylene-ethylenically unsaturated ester copolymer.

2 . The hot melt adhesive composition of claim 1 further comprising an elastomeric block copolymer comprising styrene.

3 . The hot melt adhesive composition of claim 2 , wherein the elastomeric block copolymer is selected from the group consisting of styrene-ethylene/butylene-styrene block copolymer, styrene-ethylene/propylene-styrene block copolymer, and combinations thereof.

4 . The hot melt adhesive composition of claim 1 comprising at least 45% by weight of the unmodified, semi-crystalline propylene polymer.

5 . The hot melt adhesive composition of claim 1 comprising at least 50% by weight of the unmodified, semi-crystalline propylene polymer.

6 . The hot melt adhesive composition of claim 1 comprising at least 55% by weight of the unmodified, semi-crystalline propylene polymer.

7 . The hot melt adhesive composition of claim 1 , wherein the first non-functionalized wax comprises polyethylene wax, Fischer Tropsch wax or a combination thereof.

8 . The hot melt adhesive composition of claim 1 , wherein the first non-functionalized wax has a melting point greater than 100° C.

9 . The hot melt adhesive composition of claim 8 , wherein the second non-functionalized wax has a melting point greater than 115° C.

10 . The hot melt adhesive composition of claim 1 further comprising a functionalized wax.

11 . The hot melt adhesive composition of claim 10 , wherein the first non-functionalized wax comprises polyethylene wax, Fischer Tropsch wax or a combination thereof, and the functionalized wax comprises maleated polyethylene wax, maleated polypropylene wax, or a combination thereof.

12 . The hot melt adhesive composition of claim 1 comprising greater than 20% by weight wax.

13 . The hot melt adhesive composition of claim 1 , wherein the unmodified, semi-crystalline propylene polymer has a heat of fusion of from 15 J/g to no greater than 50 J/g.

14 . The hot melt adhesive composition of claim 1 , wherein the composition exhibits a set time no greater than 2 seconds.

15 . The hot melt adhesive composition of claim 1 , wherein the composition exhibits a heat stress resistance of greater than 60° C. and a set time no greater than 1 second.

16 . The hot melt adhesive composition of claim 1 , wherein the composition exhibits a heat stress resistance of greater than 60° C., greater than 50% fiber tear at 4° C. and greater than 50% fiber tear at 60° C., and a set time of no greater than 1.5 seconds.

17 . The hot melt adhesive composition of claim 1 , wherein the composition exhibits a heat stress resistance of greater than 71° C., greater than 50% fiber tear at 4° C. and greater than 50% fiber tear at 71° C., and a set time of no greater than 1.5 seconds.

18 . The hot melt adhesive composition of claim 1 further comprising oil, polybutene, or a combination thereof.

19 . The hot melt adhesive composition of claim 1 , wherein the composition exhibits a viscosity of no greater than 2000 centipoise at 177° C.

20 . The hot melt adhesive composition of claim 1 comprising:
from 45% by weight to about 70% by weight unmodified, semi-crystalline propylene polymer;
from about 20% by weight to about 35% by weight non-functionalized wax; and
from about 1% by weight to about 10% by weight functionalized wax.

21 . The hot melt adhesive composition of claim 20 , comprising from 50% by weight to about 65% by weight unmodified, semi-crystalline polypropylene polymer.

22 . The hot melt adhesive composition of claim 20 , wherein the unmodified, semi-crystalline propylene polymer comprises an unmodified, metallocene-catalyzed semi-crystalline propylene copolymer, an unmodified, non-metallocene heteroaryl-catalyzed, semi-crystalline propylene copolymer, or a combination thereof.

23 . The hot melt adhesive composition of claim 20 , wherein the unmodified, semi-crystalline propylene polymer exhibits a viscosity of no greater than 1200 cP at 190° C.

24 . The hot melt adhesive composition of claim 20 , wherein the composition exhibits a heat stress resistance of greater than 60° C., greater than 50% fiber tear at −18° C., and greater than 50% fiber tear at 60° C.

25 . The hot melt adhesive composition of claim 20 , wherein the composition exhibits a viscosity of no greater than 1500 centipoise at 149° C.

26 . A package comprising:
the hot melt adhesive composition of claim 1 ; a first substrate comprising fibers; and a second substrate comprising fibers, the second substrate bonded to the first substrate through the adhesive composition.

27 . A hot melt adhesive composition comprising:
at least 40% by weight of an unmodified, semi-crystalline propylene polymer comprising at least 50% by weight propylene; at least 15% by weight non-functionalized wax; from 0% by weight to no greater than 10% by weight functionalized wax; and from 1% by weight to 10% by weight elastomeric block copolymer comprising styrene.

28 . A hot melt adhesive composition comprising:
at least 55% by weight of a semi-crystalline propylene polymer comprising at least 50% by weight propylene; and greater than 20% by weight wax, the wax comprising a first wax, a second wax different from the first wax, and from 0% by weight to no greater than 10% by weight, based on the weight of the hot melt adhesive composition, functionalized wax, the hot melt adhesive composition exhibiting a set time of no greater than 2 seconds.

Assignees

• Fuller H B Co

Inventors

• Kauffman Thomas F
• Schmidt Scott C
• Mosanu Claudia
• Roska Timothy W
• Schmit Amanda L
• Ahmed Sharf U
• Roy Gary L

Classifications

• B32B5/08

  the fibres or filaments of a layer being of different substances {, e.g. conjugate fibres, mixture of different fibres} · CPC title

• B32B5/02

  characterised by structural features of a {fibrous or filamentary} layer {(layer formed of metallic wires B32B15/02; layer formed of natural mineral fibres B32B19/02; layer formed of wood fibres B32B21/02)} · CPC title

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• B32B2555/00

  Personal care · CPC title

• B32B27/06

  as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)} · CPC title