A process for preparing a (meth)acrylate additive, a method of improving the sag resistance of a polyolefin and a sag resistant polyolefin

Patent metadata

Field	Value
Publication number	US-2017267788-A1
Application number	US-201515532314-A
Country	US
Kind code	A1
Filing date	Nov 29, 2015
Priority date	Dec 8, 2014
Publication date	Sep 21, 2017
Grant date	—

Abstract

A process for preparing a (meth)acrylate comprising preparing an aqueous phase by combining water, one or more stabilizing agents, and one or more surfactants; preparing an oil phase by combining one or more free radical initiators, one or more monomers capable of undergoing radical polymerization, one or more crosslinking and/or graft-linking monomers, and stearyl methacrylate and/or lauryl methacrylate, wherein the free radical initiator is capable of partitioning preferentially into the oil phase; combining the aqueous and oil phases and mixing to form a suspension having oil droplets ranging in size from 1 to 10 microns; raising the temperature of the suspension to effect an initial polymerization forming a core polymer is provided.

First claim

1 . A process for preparing a (meth)acrylate comprising:
preparing an aqueous phase by combining water, one or more stabilizing agents, and one or more surfactants; preparing an oil phase by combining one or more free radical initiators, one or more monomers capable of undergoing radical polymerization, one or more crosslinking and/or graft-linking monomers, and stearyl methacrylate and/or lauryl methacrylate, wherein the free radical initiator is capable of partitioning preferentially into the oil phase; combining the aqueous and oil phases and mixing to form a suspension having oil droplets ranging in size from 1 to 10 microns; and raising the temperature of the suspension to effect an initial polymerization forming a core polymer.

2 . The process of claim 1 , wherein the one or more free radical initiators is lauroyl peroxide and/or t-butyl peroctoate.

3 . The process according to claim 1 , wherein the mixing is by a high speed rotor stator mixer.

4 . The process according to claim 1 , wherein at least 90 wt % of the stearyl methacrylate and/or lauryl methacrylate is incorporated into polymer formed during the initial polymerization.

5 . The process according to claim 1 , further comprising:
adding a solution which comprises one or more monomers capable of radical polymerization while maintaining the temperature during the initial polymerization to effect a second polymerization; optionally adjusting the temperature for the second polymerization.

6 . The process of claim 5 , further comprising:
adding a flow aid to form a core/shell polymer suspension; and spray drying the core/shell polymer suspension to form a free flowing powder of core/shell polymer.

7 . The core polymer formed by the process according to claim 1 .

8 . The core/shell polymer formed by claim 6 .

9 . A method of modifying the sag resistance of an olefin-based polymer comprising:
adding from 1 to 10 wt % of the core polymer of claim 8 and/or the core/shell polymer of claim 8 to one or more polyolefins.

10 . A polyolefin having improved sag resistance comprising:
one or more olefin-based polymers; and one or more core polymers formed by a process which comprises (i) preparing an aqueous phase by combining water, one or more stabilizing agents, and one or more surfactants; (ii) preparing an oil phase by combining one or more free radical initiators, one or more monomers capable of undergoing radical polymerization, one or more crosslinking and/or graft-linking monomers, and stearyl methacrylate and/or lauryl methacrylate, wherein the free radical initiator is capable of partitioning preferentially into the oil phase; (iii) combining the aqueous and oil phases and mixing to form a suspension having oil droplets ranging in size from 1 to 10 microns; (iv) raising the temperature of the suspension to effect an initial polymerization forming a core polymer and/or one or more core/shell polymers according to claim 8 .

11 . (canceled)

Assignees

• Rohm & Haas

Inventors

• Cruz Carlos A
• Wills Morris C

Classifications

• C08L23/04

  Homopolymers or copolymers of ethene · CPC title

• C08F265/04

  on to polymers of esters · CPC title

• C08L51/00

  Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds (for ABS polymers C08L55/02); Compositions of derivatives of such polymers · CPC title

• C08F4/00

  Polymerisation catalysts · CPC title

• C08F2/20 Primary

  with the aid of macromolecular dispersing agents · CPC title