Thermoplastic resin composition and hot-melt adhesive

Patent metadata

Field	Value
Publication number	US-12018182-B2
Application number	US-201917271989-A
Country	US
Kind code	B2
Filing date	Sep 2, 2019
Priority date	Sep 4, 2018
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

The present invention relates to a thermoplastic resin composition containing a base polymer containing a propylene-based polymer (A) in which a melting endotherm (ΔH-D) is 0 J/g or more and 60 J/g or less, and a melting point (Tm-D) is not observed or is 0° C. or higher and 120° C. or lower; and a propylene-based polymer (C) in which a melting endotherm (ΔH-D) is 20 J/g or more and 120 J/g or less, and a melting point (Tm-D) is higher than 120° C., the content of the propylene-based polymer (C) being 0.5 parts by mass or more and 100 parts by mass or less relative to 100 parts by mass of the content of the propylene-based polymer (A).

First claim

The invention claimed is:

1. A thermoplastic resin composition, comprising:
a base polymer comprising (A) a propylene-based polymer (A) having a melting endotherm (ΔH-D) in a range of from 0 to 60 J/g, and a melting point (Tm-D) is in a range of from 0 to 120° C., and (B) an ethylene-based polymer having a melting endotherm (ΔH-D) in a range of from 0 to 120 J/g; and
a propylene-based polymer (C) in which a melting endotherm (ΔH-D) is in a range of from 20 to 120 J/g, and a melting point (Tm-D) is higher than 120° C.,
wherein a content of the propylene-based polymer (C) is in a range of from 0.5 to 50 parts by mass, relative to 100 parts by mass of the propylene-based polymer (A),
wherein the ethylene-based polymer (B) is present in 10,000 parts by mass or less, relative to 100 parts by mass of the propylene-based polymer (A), and
wherein the propylene-based polymer (A) is a propylene homopolymer.

2. The composition of claim 1 , wherein the melting point (Tm-D) of the propylene-based polymer (C) is 150° C. or lower.

3. The composition of claim 1 , wherein a total content of the propylene-based polymer (A) and the ethylene-based polymer (B) occupying in the thermoplastic resin composition is more than 70% by mass.

4. The composition of claim 1 , wherein a total content of the propylene-based polymer (A) and the ethylene-based polymer (B) occupying in the thermoplastic resin composition is 70% by mass or less.

5. The composition of claim 1 , wherein the content of the propylene-based polymer (A) is 50% by mass or more, relative to a total mass of the propylene-based polymer (A) and the ethylene-based polymer (B).

6. The composition of claim 1 , further comprising:
a linear hydrocarbon-based wax (D) in which a melting endotherm (ΔH-D) is more than 120 J/g and 300 J/g or less,
wherein a content of the linear hydrocarbon-based wax (D) is 10,000 parts by mass or less, relative to 100 parts by mass of the base polymer.

7. The composition of claim 1 , wherein the propylene-based polymer (A) comprises a structural unit selected from the group consisting of ethylene and an α-olefin having 4 to 30 carbon atoms in an amount of more than 0 mol % and 40 mol % or less.

8. The composition of claim 1 , further comprising:
an oil (E).

9. The composition of claim 1 , further comprising:
a tackifier (F).

10. The composition of claim 1 , further comprising:
a nucleating agent (G).

11. The composition of claim 10 , wherein the nucleating agent (G) is at least one selected from the group consisting of a sorbitol-based nucleating agent and a nonitol-based nucleating agent.

12. A method of producing the thermoplastic resin composition of claim 1 , the method comprising:
mixing at least the base polymer and the propylene-based polymer (C) at lower than 160° C.

13. A hot-melt adhesive, comprising:
the thermoplastic resin composition of claim 1 .

14. A thermoplastic resin composition, comprising:
a base polymer comprising (A) a propylene-based polymer (A) having a melting endotherm (ΔH-D) in a range of from 0 to 60 J/g, and a melting point (Tm-D) is not observed, and (B) an ethylene-based polymer having a melting endotherm (ΔH-D) in a range of from 0 to 120 J/g; and
a propylene-based polymer (C) in which a melting endotherm (ΔH-D) is in a range of from 20 to 120 J/g, and a melting point (Tm-D) is higher than 120° C.,
wherein a content of the propylene-based polymer (C) is in a range of from 0.5 to 50 parts by mass, relative to 100 parts by mass of the propylene-based polymer (A),
wherein the ethylene-based polymer (B) is present in 10,000 parts by mass or less, relative to 100 parts by mass of the propylene-based polymer (A), and
wherein the propylene-based polymer (A) is a propylene homopolymer.

15. The composition of claim 14 , wherein the melting point (Tm-D) of the propylene-based polymer (C) is 150° C. or lower.

16. The composition of claim 14 , wherein a total content of the propylene-based polymer (A) and the ethylene-based polymer (B) occupying in the thermoplastic resin composition is more than 70% by mass.

17. The composition of claim 14 , wherein a total content of the propylene-based polymer (A) and the ethylene-based polymer (B) occupying in the thermoplastic resin composition is 70% by mass or less.

18. The composition of claim 14 , wherein the content of the propylene-based polymer (A) is 50% by mass or more, relative to a total mass of the propylene-based polymer (A) and the ethylene-based polymer (B).

19. The composition of claim 14 , further comprising:
a linear hydrocarbon-based wax (D) in which a melting endotherm (ΔH-D) is more than 120 J/g and 300 J/g or less,
wherein a content of the linear hydrocarbon-based wax (D) is 10,000 parts by mass or less, relative to 100 parts by mass of the base polymer.

20. The composition of claim 14 , wherein the propylene-based polymer (A) comprises a structural unit selected from the group consisting of ethylene and an α-olefin having 4 to 30 carbon atoms in an amount of more than 0 mol % and 40 mol % or less.

Assignees

• Idemitsu Kosan Co

Inventors

• Fujii Nozomu
• Kanamaru Masami
• Koga Asami

Classifications

• C09J2491/00

  Presence of oils, fats or waxes · CPC title

• C09J2423/10

  Presence of homo or copolymers of propene · CPC title

• C09J2423/04

  Presence of homo or copolymers of ethene · CPC title

• C09J191/00

  Adhesives based on oils, fats or waxes; Adhesives based on derivatives thereof · CPC title

• C09J123/0815

  Copolymers of ethene with aliphatic 1-olefins · CPC title