Claims
- 1. A process for preparing a piperidinyl phosphite composition comprising:
- (1) mixing a solution of (a) a piperidinyl phosphite compound of the formula: ##STR3## wherein R is a C.sub.1-4 alkyl, a C.sub.1-4 alkoxy or a C.sub.1-8 alkanoyl group, and R' is a C.sub.1-4 alkyl group, in a solvent, with a solution of a sorbitol compound having a melting point greater than 155.degree. C. selected from the group consisting of dibenzylidene sorbitol, bis(p-methylbenzylidene) sorbitol, bis(3,5-dimethylbenzylidene) sorbitol and bis(p-ethylbenzylidene) sorbitol, in a solvent, wherein both solvents are polar solvents that do not react with the piperdinyl phosphite compound or with the sorbitol compound and the ratio of (a) to (b) is from 1:1 to 1:10 or 2:1,
- (2) evaporating the solvent to obtain a mixture of the piperidinyl phosphite compound and the sorbitol compound,
- (3) drying the mixture, and
- (4) pulverizing.
- 2. The piperidinyl phosphite composition of claim 1, wherein the piperidinyl phosphite compound is a tris-(1,2,2,6,6-pentamethylpiperidinyl) phosphite.
- 3. A polyolefin composition comprising (A) 100 parts of a propylene polymer material and (B) from 0.02 to 0.6 parts of a piperidinyl phosphite composition consisting essentially of a mixture of (a) a piperidinyl phosphite compound of the formula: ##STR4## wherein R is a C.sub.1-4 alkyl group, a C.sub.1-4 alkoxy group or a C.sub.1-8 alkanoyl group, and R' is a C.sub.1-4 alkyl group; and (b) a sorbitol compound having a melting point greater than 155.degree. C. selected from the group consisting of dibenzylidene sorbitol, bis(p-methylbenzylidene) sorbitol, bis(3,5-dimethylbenzylidene) sorbitol and bis(p-ethylbenzylidene) sorbitol, wherein the ratio of (a) to (b) is from 1:1 to 1:10 or 2:1 and the mixture is prepared by the process of claim 1.
- 4. The composition of claim 3, wherein the propylene polymer material of component (A) is a homopolymer of propylene, or a copolymer of propylene and ethylene or a C.sub.4-10 alpha-olefin.
- 5. The composition of claim 4, wherein the piperidinyl phosphite compound is a tris-(1,2,2,6,6-pentamethylpiperidinyl) phosphite.
Parent Case Info
This application is a continuation of application Ser. No. 08/145,288, filed Oct. 29, 1993 now abandoned.
US Referenced Citations (14)
Foreign Referenced Citations (4)
Number |
Date |
Country |
997353 |
Sep 1976 |
CAX |
54-103461 |
Aug 1979 |
JPX |
01311065 |
Dec 1989 |
JPX |
2265377 |
Sep 1993 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
145288 |
Oct 1993 |
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