Moisture-curable polyolefin formulation

Patent metadata

Field	Value
Publication number	US-11840587-B2
Application number	US-201917426477-A
Country	US
Kind code	B2
Filing date	Feb 13, 2019
Priority date	Feb 13, 2019
Publication date	Dec 12, 2023
Grant date	Dec 12, 2023

Abstract

A moisture-curable polyolefin formulation comprising a (hydrolyzable silyl group)-functional polyolefin prepolymer and a compound that is an iron (II) acetylacetonate or an iron (III) acetylacetonate, wherein each compound independently is unsubstituted or substituted. Also, methods of making and using same, a cured polyolefin made therefrom, and articles containing or made from same.

First claim

The invention claimed is:

1. A moisture-curable polyolefin formulation comprising:
(A) a (hydrolyzable silyl group)-functional polyolefin prepolymer; and
(B) a condensation-cure catalyst system comprising a compound that is an iron(II) acetylacetonate or an iron(III) acetylacetonate, wherein each acetylacetonate is unsubstituted or independently substituted with from 1 to 5 alkyl groups, wherein each alkyl group is unsubstituted (collectively called “iron (alkyl)acetylacetonate”);
wherein the amount of (A) is from 79.0 to 99.99 weight percent (wt %) and the amount of (B) is from 21.0 to 0.01 wt %, respectively, of the moisture-curable polyolefin formulation; and
wherein the (A) (hydrolyzable silyl group)-functional polyolefin prepolymer is a copolymer of copolymerized ethylene and an alkenyl-functional hydrolyzable silane with the alkenyl-functional hydrolyzable silane positioned along a backbone of the prepolymer.

2. The moisture-curable polyolefin formulation of claim 1 wherein the (A) (hydrolyzable silyl group)-functional polyolefin prepolymer is characterized by any one of limitations (i) to (iii): (i) each hydrolyzable silyl group is independently a monovalent group of formula (R 2 ) m (R 3 ) 3-m Si—, wherein subscript m is an integer of 1, 2, or 3; each R 2 is independently H, HO—, (C 1 -C 6 )alkoxy, (C 2 -C 6 )carboxy, phenoxy, (C 1 -C 6 )alkyl-phenoxy, ((C 1 -C 6 )alkyl) 2 N—, (C 1 -C 6 )alkyl(H)C═NO—, or ((C 1 -C 6 )alkyl) 2 C═NO—; and each R 3 is independently (C 1 -C 6 )alkyl or phenyl; (ii) the polyolefin portion of (A) is polyethylene based, poly(ethylene-co-(C 3 -C 40 )alpha-olefin)-based, or a combination thereof; and (iii) both (i) and (ii).

3. The moisture-curable polyolefin formulation of claim 1 wherein the (B) condensation-cure catalyst system is any one of (B1) to (B3): (B1) the iron(II) (alkyl)acetylacetonate; (B2) the iron(III) (alkyl)acetylacetonate; and (B3) a combination of (B1) and (B2).

4. The moisture-curable polyolefin formulation of claim 1 wherein each (alkyl)acetylacetonate of the iron (alkyl)acetylacetonate independently is an unsubstituted acetylacetonate or a (C 1 -C 6 )alkyl-substituted acetylacetonate.

5. The moisture-curable polyolefin formulation of claim 1 further comprising at least one additive selected from additives (C) to (L): (C) an organic peroxide; (D) a scorch retardant; (E) an antioxidant; (F) a treeing retardant (water treeing and/or electrical treeing retardant); (G) a colorant; (H) a moisture scavenger; (I) a hindered amine light stabilizer; (J) a processing aid; (K) a moisture generator; and (L) a combination of any two or more of (C) to (K).

6. A method of making a moisture-curable polyolefin formulation, the method comprising mixing constituents comprising (A) a (hydrolyzable silyl group)-functional polyolefin prepolymer and (B) a condensation-cure catalyst system so as to give a mixture comprising the (A) and (B); and melting or extruding the mixture so as to make the moisture-curable polyolefin formulation of claim 1 .

7. A moisture-cured polyolefin product made by moisture curing the moisture-curable polyolefin formulation of claim 1 .

8. A manufactured article comprising a shaped form of the moisture-curable polyolefin formulation of claim 1 .

9. A coated conductor comprising a conductive core and a polymeric layer at least partially surrounding the conductive core, wherein at least a portion of the polymeric layer comprises the moisture-cured polyolefin product of claim 7 .

10. A method of conducting electricity, the method comprising applying a voltage across the conductive core of the coated conductor of claim 9 so as to generate a flow of electricity through the conductive core.

Assignees

• Dow Global Technologies Llc

Inventors

• Zhang Kainan
• Sun Yabin
• Cogen Jeffrey M
• Talreja Manish
• Person Timothy J

Classifications

• C08F210/02 Primary

  Ethene · CPC title

• C08F4/70

  Iron group metals, platinum group metals or compounds thereof · CPC title

• C08K5/0091

  Complexes with metal-heteroatom-bonds · CPC title

• C08L23/0892

  with monomers containing atoms other than carbon, hydrogen or oxygen · CPC title

• C08F2800/20

  as weight or mass percentages · CPC title