Process for crosslinking

• US 5,346,961 A
• Filed: 04/07/1993
• Issued: 09/13/1994
• Est. Priority Date: 04/07/1993
• Status: Expired due to Term

• Current Assignee: Union Carbide Chemicals & Plastics Technology Corporation (Dow, Inc.)
• Original Assignee: Union Carbide Chemicals & Plastics Technology Corporation (Dow, Inc.)
• Inventors: Caronia, Paul J., Shaw, Richard G.
• Primary Examiner(s): Lipman, Bernard
• Application Number:
  US08/043,564
• Time in Patent Office: 524 Days
• Field of Search: 525/281, 525/287, 525/300, 525/304, 525/305, 525/308, 525/309, 264/211.24
• US Class Current: 525/281
• CPC Class Codes: B29B 7/007 for continuous mixing
• CPC Class Codes: B29B 7/826 Apparatus therefor
• CPC Class Codes: B29B 7/88 Adding charges , i.e. additives
• CPC Class Codes: B29B 7/90 Fillers or reinforcements , e.g. fibres
• CPC Class Codes: C08F 255/02 on to polymers of olefins having two or three carbon atoms
• CPC Class Codes: C08F 2810/20 leading to a crosslinking, either explicitly or inherently

Abstract

A process for crosslinking comprising (a) introducing into a reactor, under crosslinking conditions, a mixture comprising

(i) one or more polyolefins;

(ii) organic peroxide;

(iii) an ester, ether, or ketone containing two or more unsaturated groups; and

(iv) a compound having the formula: ##STR1## wherein R=hydrogen, methyl, or ethyl; R¹ =an alkylene having 1 to 6 carbon atoms;

and

R² =an alkyl having 8 or more carbon atoms or Si(R³)₃ wherein R³ is hydrogen or alkoxy having 1 to 6 carbon atoms; each R³ is the same or different; and at least one R³ is an alkoxy,

and (b) crosslinking the polyolefin(s).

Claims

1. A process for crosslinking comprising (a) introducing into a reactor, under crosslinking conditions, a mixture comprising

(i) one or more polyolefins;

(ii) organic peroxide;

(iii) an ester, ether or ketone containing two or more unsaturated groups; and

(iv) a compound having the formula;

##STR5## wherein R=hydrogen, methyl, or ethyl;

R¹ =an alkylene having 1 to 6 carbon atoms; and

R² =an alkyl having 8 or more carbon atoms or Si(R³)₃ wherein R³ is hydrogen or alkoxy having 1 to 6 carbon atoms;

each R³ is the same or different; and

at least one R³ is an alkoxy,

and (b) crosslinking the polyolefin(s).

2. The process defined in claim 1 wherein the polyolefin is a polyethylene .

3. The process defined in claim 1 wherein the organic peroxide is dicumyl peroxide.

4. The process defined in claim 1 wherein component (iii) is triallyl cyanurate.

5. The process defined in claim 1 wherein component (iv) is lauryl methacrylate.

6. The process defined in claim 1 wherein for each 100 parts by weight of polyolefin, the proportions are about as follows:

space="preserve" listing-type="tabular">______________________________________ Component Parts by Weight ______________________________________ (ii) 0.2 to 2.0 (iii) 0.1 to 1.8 (iv) 0.1 to 2.0 ______________________________________

7. A process for extrusion comprising (a) introducing into an extruder a mixture of (i) VLDPE, and, for each 100 parts by weight of VLDPE, the following components in about the following proportions:

space="preserve" listing-type="tabular">______________________________________ Component Parts by Weight ______________________________________ (ii) dicumyl peroxide 0.2 to 2.0 (iii) triallyl cyanurate 0.1 to 1.8 or triallyl isocyanurate (iv) lauryl methacrylate 0.1 to 2.0 ______________________________________

(b) extruding the mixture at a temperature in the range of about 130°

to about 260°

C., and (c) crosslinking the extrudate.

8. A composition comprising:

(i) one or more polyolefins;

;

(ii) organic peroxide;

(iii) ester, ether, or ketone containing two or more unsaturated groups; and

(iv) a compound having the formula;

space="preserve" listing-type="tabular">______________________________________ Component Parts by Weight ______________________________________ (ii) dicumyl peroxide 0.2 to 2.0 (iii) triallyl cyanurate 0.1 to 1.8 or triallyl isocyanurate (iv) lauryl methacrylate 0.1 to 2.0 ______________________________________ ##STR6## wherein R=hydrogen, methyl, or ethyl;

R.sup.1 =an alkylene having 1 to 6 carbon atoms; and

R² =an alkyl having 8 or more carbon atoms or Si(R³)₃ wherein R³ is hydrogen or alkoxy having 1 to 6 carbon atoms;

each R³ is the same or different; and

at least one R³ is an alkoxy,

9. The composition defined in claim 8 wherein the polyolefin is polyethylene.

10. A composition comprising:

(i) VLDPE, and for each 100 parts by weight of VLDPE, the following components in about the following proportions;

##STR7##