IP Library › Granted Patent US 12674046
Granted Patent B2
US 12674046 · App. 18/007,473 · Granted Jul 7, 2026

Adhesive formulations based on ethylene multi-block interpolymers and functionalized propylene-based polymers

Inventors: Wanfu Ma (Shanghai, CN); Allan Walter Mclennaghan (Lachen, CH); Jozef Van Dun (Antwerp, BE); Yanzhen Huang (Shanghai, CN)
Assignee: Dow Global Technologies LLC
C08L23/0807C08L23/14C08L51/06C08L91/06C08L93/00C09J7/35C09J7/38C09J11/08C09J123/0807C09J123/14C09J151/06C09J153/00C08L2205/035C09J2301/312C09J2423/04C09J2423/10C09J2451/00C09J2453/00C09J2491/00C09J2493/00
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Quick Facts
Patent No.
US 12674046
App. No.
18/007,473
Granted
Jul 7, 2026
Kind
B2
Abstract

A hot melt adhesive (HMA) composition comprises: a) an ethylene/alpha-olefin multi-block interpolymer that has a melt viscosity (177° C.)≤50,000 mPa·s; b) an anhydride and/or carboxylic acid functionalized propylene-based polymer that has a melt viscosity (190° C.)≤50,000 mPa·s; c) a tackifier; and d) a wax. Such composition delivers both a high temperature heat resistance and a fast set time.

Claims (26)

1 . A composition comprising the following components:

a) an ethylene/alpha-olefin multi-block interpolymer that has a melt viscosity (177° C.)≤50,000 mPa·s;

b) an anhydride and/or carboxylic acid functionalized propylene-based polymer that has a melt viscosity (190° C.)≤50,000 mPa·s and wherein the anhydride and/or carboxylic acid functional propylene-based polymer (component b) has a melt viscosity (190° C.)≥12,000 mPa·s;

c) a tackifier; and

d) a wax;

wherein the composition comprises from 30.0 wt % to 50.0 wt % of the sum of component a and component b, based on the weight of the composition; and

wherein the composition has Fiber Tear (at 70° C.)≥90%.

2 . The composition of claim 1 , wherein the ethylene/alpha-olefin multi-block interpolymer (component a) is an ethylene/alpha-olefin multi-block copolymer.

3 . The composition of claim 1 , wherein the ethylene/alpha-olefin multi-block interpolymer (component a) has a density from 0.860 g/cc to 0.890 g/cc.

4 . The composition of claim 1 , wherein the anhydride and/or carboxylic acid functionalized propylene-based polymer (component b) has a density from 0.888 g/cc to 0.920 g/cc.

5 . The composition of claim 1 , wherein the anhydride and/or carboxylic acid functionalized propylene-based polymer (component b) has a melting point (Tm) from 100° C. to 160° C.

6 . The composition of claim 1 , wherein component b is a grafted anhydride and/or carboxylic acid propylene-based polymer.

7 . The composition of claim 1 , wherein component b is an anhydride and/or carboxylic acid functionalized propylene/ethylene copolymer.

8 . The composition of claim 1 , wherein the weight ratio of component a to component b is from 0.10 to 5.00.

9 . The composition of claim 1 , wherein the weight ratio of component c to component a is from 1.00 to 5.00.

10 . The composition of claim 1 , wherein the weight ratio of component c to component b is from 1.00 to 5.00.

11 . The composition of claim 1 , wherein component c is a hydrocarbon resin.

12 . The composition of claim 1 , wherein the wax (component d) has a density from 0.920 g/cc to 0.960 g/cc.

13 . The composition of claim 1 , wherein the wax (component d) has a melt viscosity (135° C.) from 4.0 mPas to 30 mPa·s.

14 . The composition of claim 1 , wherein the composition has a melt viscosity (177° C.) from 200 mPa·s to 8,000 mPa·s.

15 . The composition of claim 1 , wherein the composition has set time ≤2.0 s.

16 . The composition of claim 1 , wherein the composition has Fiber Tear (at −20° C.)≥90%.

17 . The composition of claim 1 , wherein the composition has Fiber Tear, at a temperature from −20° C. to 70° C., ≥90%.

18 . The composition of claim 1 , wherein the anhydride and/or carboxylic acid functionalized propylene-based polymer has a melt viscosity (190° C.) from 14,000 to 30,000 mPa·s.

19 . The composition of claim 1 , wherein the composition has a PAFT ≥70° C.

20 . An article comprising at least one component formed from the composition of claim 1 .