Polyolefin based hot melt adhesive composition

• US 6,486,246 B1
• Filed: 10/04/1999
• Issued: 11/26/2002
• Est. Priority Date: 02/03/1998
• Status: Expired due to Fees

• Current Assignee: Montell Technology Company BV
• Original Assignee: Montell Technology Company BV
• Inventors: Vion, Jean Marc
• Primary Examiner(s): SZEKELY, PETER A
• Application Number:
  US09/402,381
• Time in Patent Office: 1,149 Days
• Field of Search: 524/271, 524/274, 524/499, 524/474, 525/133, 525/210, 525/211, 525/240, 156/176, 156/334, 428/97
• US Class Current: 524/271
• CPC Class Codes: C08L 2207/02 Heterophasic composition
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C09J 123/10 Homopolymers or copolymers of propene
• CPC Class Codes: C09J 123/16 Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers

Abstract

A hot melt adhesive polyolefin composition having a viscosity from 7,000 to less than 500,000 mPa·sec, at 190° C. including (by weight): I) 5-85% of a crystalline propylene polymer selected from a propylene homopolymer and a copolymer of propylene and ethylene or a C₄-C₁₀ α-olefin or blends thereof, having an isotactic index from 80 to 98%; II) 5-85% of an heterophasic polyolefin composition including: (i) a crystalline propylene polymer and (ii) and an amorphous copolymer of ethylene and propylene or a C₄-C₁₀ α-olefin or blends thereof, containing less than 40% of ethylene; III) 10-75% of a material selected from aliphatic hydrocarbon resins, terpene/phenolic resin, polyterpenes, rosin, rosin esters and blends thereof; and optionally IV) a mineral paraffinic or naphthalenic oil, an amorphous poly(α-olefin) having low molecular weight or a mixture thereof.

Claims

1. A hot melt adhesive polyolefin composition having a viscosity of from 7,000 to less than 500,000 mPa·

sec at 190°

C. comprising by weight;

I. 5-85% of a crystalline propylene polymer having an isotactic index from 80 to 98% and selected from the group consisting of a propylene homopolymer, a copolymer of propylene and ethylene or a C₄-C₁₀ α

-olefin and blends thereof;

II. 5-85% of a heterophasic polyolefin composition comprising (i) a crystalline propylene polymer and (ii) an amorphous copolymer of ethylene and propylene or a C₄-C₁₀ α

-olefin or blends thereof, containing less than 40% ethylene;

III. 10-75% of a material selected from the group consisting of aliphatic hydrocarbon resins, terpene/phenolic resin, polyterpenes, rosin, rosin esters and blends thereof; and

IV. optionally, a mineral paraffinic or naphthalenic oil or an amorphous poly(α

-olefin) having a viscosity lower than 10,000 mPa·

sec at 190°

C., or a mixture thereof.

2. The hot melt adhesive polyolefin composition of claim 1, wherein said viscosity is from 10,000 to 80,000 mPa·

sec, and comprising 15-45% of said crystalline propylene polymer, 15-45% of said heterophasic polyolefin composition, and 10-40% of said material.

3. The hot melt adhesive polyolefin composition of claim 1, further comprising from 15 to 60% of a mineral oil.

4. The hot melt adhesive polyolefin composition of claim 1, further comprising from 1 to 75% of an amorphous poly(olefin).

5. The hot melt adhesive polyolefin composition of claim 1, wherein said heterophasic polyolefin composition (ii) comprises the following fractions:

(A) 5-50% of a crystalline propylene homopolymer with an isotactic index greater than 80%, or a crystalline copolymer of propylene and ethylene or a C₄-C₁₀ α

-olefin or a mixture thereof;

said copolymer containing more than 85% of propylene and having an isotactic index greater than 80%;

(B) 0-20% of a crystalline copolymer containing prevailingly ethylene;

said copolymer being insoluble in xylene at ambient temperature; and

(C) 40-95% of an elastomeric copolymer of ethylene and propylene or a C₄-C₁₀ α

-olefin or a mixture thereof, said elastomeric copolymer containing ethylene in an amount less than 40%, being soluble in xylene at ambient temperature, and optionally containing a diene.

6. The hot melt adhesive polyolefin composition of claim 5, comprising 10-40% of (A), 0-15% of (B), and 50-75% of (C).

7. The hot melt adhesive polyolefin composition of claim 1, wherein propylene polymer (I) and composition (II) are present in a ratio from 1.3 to 0.7.

8. An article comprising the hot melt adhesive composition of claim 1.

9. An article comprising the hot melt adhesive composition of claim 2.

10. An article comprising the hot melt adhesive composition of claim 3.

11. An article comprising the hot melt adhesive composition of claim 4.

12. An article comprising the hot melt adhesive composition of claim 5.

13. A tufted or needle punched carpet containing the hot melt adhesive composition of claim 1.

14. A tufted or needle punched carpet containing the hot melt adhesive composition of claim 2.

15. A tufted or needle punched carpet containing the hot melt adhesive composition of claim 3.

16. A tufted or needle punched carpet containing the hot melt adhesive composition of claim 4.

17. A tufted or needle punched carpet containing the hot melt adhesive composition of claim 5.

18. The carpet of claim 13, wherein said carpet has a woven or non-woven primary backing.

19. A process for preparing the carpet of claim 13, comprising the steps of:

(i) melting said adhesive composition;

(ii) casting said adhesive composition onto a carpet backing of said carpet; and

(iii)cooling the coated carpet between rolls under pressure.