Plastic living hinges with block composite polymer

Patent metadata

Field	Value
Publication number	US-11261316-B2
Application number	US-201816626041-A
Country	US
Kind code	B2
Filing date	Jun 25, 2018
Priority date	Jun 29, 2017
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

The present disclosure provides a plastic living hinge. The plastic living hinge includes a blend containing (A) an ethylene-based polymer; and (B) a composite component selected from the group consisting of a block composite, a crystalline block composite, and a combination thereof.

First claim

We claim:

1. A plastic living hinge consisting of:
a blend consisting of
(A) from 60 wt % to 95 wt % of a single ethylene-based polymer;
(B) from 40 wt % to 5 wt % of a composite component selected from the group consisting of a block composite, a crystalline block composite, and a combination thereof; and
(C) optional additives.

2. The plastic living hinge of claim 1 , wherein the ethylene-based polymer is a high density polyethylene having a density from 0.940 g/cc to 0.970 g/cc.

3. The plastic living hinge of claim 1 , wherein the composite component is a crystalline block composite.

4. The plastic living hinge of claim 3 , wherein the crystalline block composite comprises:
(i) a crystalline ethylene/propylene copolymer (CEP);
(ii) a propylene homopolymer (iPP); and
(iii) a block copolymer comprising an iPP block and a CEP block.

5. The plastic living hinge of claim 3 , wherein the blend comprises:
(A) from 70 wt % to 85 wt % high density polyethylene;
(B) from 30 wt % to 15 wt % crystalline block composite; and
the plastic living hinge has a hinge tensile strength retention ratio after 5000 cycles from 5% to 50%; and the blend has an instrumented dart impact at −20° C. load at peak from 3100 N to 3800 N.

6. The plastic living hinge of claim 1 wherein the composite component is a block composite.

7. The plastic living hinge of claim 1 , wherein the blend has an instrumented dart impact at −20° C. total energy dissipation from 32.0 J to 42.0 J.

8. The plastic living hinge of claim 1 comprising an additive.

9. The plastic living hinge of claim 1 wherein the plastic living hinge is a closure for an article selected from the group consisting of a diaper wipe container, a wet wipe container, a shampoo bottle, and a ketchup bottle.

10. The plastic living hinge of claim 1 consisting of:
a blend consisting of
(A) high density polyethylene;
(B) composite component; and
(C) from 0.0001 wt % to 2 wt % optional additives.

Assignees

• Dow Global Technologies Llc

Inventors

• Lin Yijian
• Hu Yushan
• Hogan Todd A
• Li Pi Shan Colin
• Lu Keran
• Kapur Mridula

Classifications

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• B65D1/00

  Rigid or semi-rigid containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material or by deep-drawing operations performed on sheet material (with curved or partially-curved cross-section made by winding or bending paper B65D3/00; with polygonal cross-section formed by folding B65D5/00; specially constructed to be opened by cutting, piercing or tearing of wall portions B65D17/00; rigid pallets with side walls B65D19/02) · CPC title

• C08L53/00

  Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers · CPC title

• C08L2207/062

  HDPE · CPC title

• C08L23/06 Primary

  Polyethylene · CPC title