Use of polyolefin waxes in hot melt compositions

• US 20070117894A1
• Filed: 11/17/2006
• Published: 05/24/2007
• Est. Priority Date: 11/18/2005
• Status: Abandoned Application

• Current Assignee: Clariant Produkte AG (Clariant AG)
• Original Assignee: Clariant Produkte AG (Clariant AG)
• Inventors: Hohner, Gerd, Bach, Sebastijan, Herrmann, Hans-Friedrich
• Application Number:
  US11/601,348
• Publication Number:
  US 20070117894A1
• Time in Patent Office: Days
• US Class Current: 524/270
• CPC Class Codes: C08L 2205/02 containing two or more polymers of the same C08L -group
• CPC Class Codes: C08L 23/14 Copolymers of propene C08L23/16 takes precedence
• CPC Class Codes: C08L 2314/06 Metallocene or single site catalysts
• CPC Class Codes: C08L 2666/06 Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof

Abstract

Hot melt compositions of the type according to the invention comprise up to 40% by weight of one or more isotactic homopolymer and/or copolymer waxes comprising the monomers ethylene and/or propylene and/or higher linear or branched alpha-olefins having 4 to 20 carbon atoms, which have been prepared by polymerization of the corresponding monomers in the presence of metallocene as catalyst, and at least 60% by weight of one or more amorphous, atactic polyalpha-olefins. Hot melt compositions of this kind are suitable for use as hot melt adhesives.

Claims

1. A hot melt composition comprising

a) 0.1% to 40% by weight of one or more isotactic homopolymer waxes, isotactic copolymer waxes or a mixture thereof, wherein the one or more waxes include the monomers ethylene, propylene, higher linear or branched alpha-olefins having 4 to 20 carbon atoms or a combination thereof, wherein the one or more waxes, based on the total weight of the one or more waxes, contain 0.1% to 30% by weight of structural units originating from one monomer and 70% to 99.9% by weight of structural units from the other monomer or monomers, wherein the one or more waxes have a weight-average molecular weight M_w of less than or equal to 40 000 g/mol, and are obtained by polymerization of the monomers in the presence of metallocene as catalyst, wherein the one or more waxes have a dropping point or ring &

ball softening point of between 80 and 165°

C., melt viscosity, measured at a temperature of 170°

C., of between 20 and 40 000 mPa·

s, and ha glass transition temperature, T_g, of not more than −

20°

C., and

b) at least 60% by weight of one or more amorphous, atactic polyalpha-olefins.

2. The hot melt composition as claimed in claim 1, comprising

a) one or more isotactic homopolymer waxes isotactic copolymer waxes or a mixture thereof comprising the monomers ethylene propylene or both, and

b) one or more amorphous, atactic polyalpha-olefins.

3. The hot melt composition as claimed in claim 1, comprising

a) one or more isotactic propylene homopolymer waxes, isotactic propylene copolymer waxes or a mixture thereof, and

b) one or more amorphous, atactic polyalpha-olefins.

4. The hot melt composition as claimed in claim 1, comprising

a) one or more olefin homopolymer or copolymer waxes or a mixture thereof, originating from ethylene and at least one branched or unbranched 1-alkene having 3 to 20 carbon atoms, the amount of structural units from the one or more 1-alkenes having 3 to 20 carbon atoms in the one or more waxes being from 0.1% to 30% by weight.

5. The hot melt composition as claimed in claim 1, wherein the one or more waxes have a number-average molar mass M_n of between 500 and 20 000 g/mol, and a weight-average molar mass M_w of between 1000 and 40 000 g/mol.

8. A hot melt adhesive comprising the hot melt composition as claimed in claim 1.

9. The hot melt composition as claimed in claim 1, wherein the one or more waxes have a number-average molar mass M_n of between 800 and 10 000 g/mol, and a weight-average molar mass M_w of between 1600 and 30 000 g/mol.

10. The hot melt composition as claimed in claim 1, wherein the one or more waxes have a number-average molar mass M_n of between 1000 and 5000 g/mol, and a weight-average molar mass M_w of between 2000 and 25 000 g/mol.

11. The hot melt composition as claimed in claim 1, further comprising 2% to 15% by weight of a resin.

12. The hot melt composition as claimed in claim 1, further comprising 5% to 12% by weight of a resin.

6. The hot melt composition as claimed in further comprising 0.1% to 19.9% by weight, of a resin.

7. The hot melt composition as claimed in claim 6, wherein the resin is a rosin and derivatives thereof or a hydrocarbon resin.