Claims
- 1. A polyolefin resin composition improved in stability to thermal processing comprising of a polyolefin resin, a phenolic compound in an amount effective to prevent deterioration of the polyolefin resin due to heat and oxidation,
- and a phosphorous compound in an amount of 0.5 to 10 times by weight based on the weight of the phenolic compound, said phenolic compound being represented by the formula: ##STR7## and said phosphorous compound being one member selected from the group consisting of the compounds represented by the structural formulas (IV-1), (IV-2), and (IV-3), recited below:
- (a) a phosphite compound represented by the formula (IV-1): ##STR8## wherein R.sub.2, R.sub.3 and R.sub.4 each represent a hydrogen atom or a C.sub.1 -C.sub.9 alkyl group, but R.sub.3 and R.sub.4 are not a branched alkyl group at the same time,
- (b) a phosphite compound represented by the formula (IV-2): ##STR9## wherein R.sub.5 represents a C.sub.8 -C.sub.18 alkyl or C.sub.6 -C.sub.18 aryl group, or
- (c) a phosphorous compound represented by the formula (IV-3):
- (R.sub.6 --O.sub.2 --P--R.sub.7 --P--O--R.sub.6).sub.2 (IV- 3)
- wherein R.sub.6 represents a C.sub.8 -C.sub.18 alkyl or C.sub.6 -C.sub.18 aryl group, and R.sub.7 represents a C.sub.6 -C.sub.18 alkylene or a C.sub.6 -C.sub.18 arylene group.
- 2. The polyolefin resin composition as claimed in claim 1, wherein the phosphorous compound is the one represented by the formula (IV-1) and is selected from the group consisting of tris(2,5-di-tert-butylphenyl)phosphite, tris(2-tert-butylphenyl)phosphite, tris[2,4-bis(1,1-dimethylpropyl)-phenyl]phosphite and tris(2,4-di-tert-butylpheny) phosphite.
- 3. The polyolefin resin composition as claimed in claim 1, wherein the phosphorous compound is the one represented by the formula (IV-2) and is selected from the group consisting of dilauryl pentaerythritol diphosphite, distearyl pentaerythritol disphosphite, bis(2,5-di-tert-butylphenyl)pentaerythritol diphosphite and bis(2,4-di-tert-butylphenyl)pentaerythritol disphosphite.
- 4. The polyolefin resin composition as claimed in claim 1, wherein the phosphorous compound is the one represented by the formula (IV-3) and is selected from the group consisting of tetrastearyl-4,4'-bisphenylene diphosphonite and tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenylene diphosphonite.
- 5. The polyolefin resin composition as claimed in claim 1, wherein the total amount of the phenolic compound and phosphorous compound is from 0.01% to 10% by weight based on the polyolefin resin.
- 6. A method for improving a polyolefin resin in stability to thermal processing, which comprises blending the polyolefin resin with
- a phenolic compound in an amount effective to prevent deterioration of the polyolefin resin due to heat and oxidation, and
- a phosphorous compound in an amount of 0.5 to 10 times by weight based on the weight of the phenolic compound, said phenolic compound being represented by the formula: ##STR10## and said phosphorous compound being one member selected from the group consisting of the compounds represented by the structural formulas (IV-1), (IV-2), and (IV-3), recited below:
- (a) a phosphite compound represented by the formula (IV-1): ##STR11## wherein R.sub.2, R.sub.3 and R.sub.4 each represent a hydrogen atom or a C.sub.1 -C.sub.9 alkyl group, but R.sub.3 and R.sub.4 are not a branched alkyl group at the same time,
- (b) a phosphite compound represented by the formula (IV-2): ##STR12## wherein R.sub.5 represents a C.sub.8 -C.sub.18 alkyl or C.sub.6 -C.sub.18 aryl group, or
- (c) a phosphorous compound represented by the formula (IV-3):
- (R.sub.6 --O.sub.2 --P--R.sub.7 --P--O--R.sub.6).sub.2 (IV- 3)
- wherein R.sub.6 represents a C.sub.8 -C.sub.18 alkyl or C.sub.6 -C.sub.18 aryl group, and R.sub.7 represents a C.sub.6 -C.sub.18 alkylene or a C.sub.6 -C.sub.18 arylene group.
- 7. In a method for producing a polyolefin resin product by thermal processing, the improvement of which comprises subjecting to thermal processing a polyolefin resin blended with a phenolic compound in an amount effective to prevent deterioration of the polyolefin resin due to heat and oxidation and a phosphorous compound in an amount of 0.5 to 10 times by weight based on the weight of the phenolic compound, said phenolic compound being represented by the formula: ##STR13## and said phosphorous compound being one member selected from the group consisting of the compounds represented by the structural formulas (IV-1), (IV-2), and (IV-3), recited below:
- (a) a phosphite compound represented by the formula (IV-1) ##STR14## wherein R.sub.2, R.sub.3 and R.sub.4 each represent a hydrogen atom or a C.sub.1 -C.sub.9 alkyl group, but R.sub.3 and R.sub.4 are not a branched alkyl group at the same time,
- (b) a phosphite compound represented by the formula (IV-2): ##STR15## wherein R.sub.5 represnets a C.sub.8 -C.sub.18 alkyl or C.sub.6 -C.sub.18 aryl group, or
- (c) a phosphorous compound represnted by the formula (IV-3):
- (R.sub.6 --O.sub.2 --P--R.sub.7 --P--O--R.sub.6).sub.2 (IV- 3)
- wherein R.sub.6 represents a C.sub.8 -C.sub.18 alkyl or C.sub.6 -C.sub.18 aryl group, and R.sub.7 represents a C.sub.6 -C.sub.18 alkylene or a C.sub.6 -C.sub.18 arylene group.
Parent Case Info
This application is a continuation of application Ser. No. 893,639, filed Aug. 7, 1986, now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4670493 |
Asbroeck et al. |
Jun 1987 |
|
4717745 |
Ishii et al. |
Jan 1988 |
|
4721744 |
Ishii et al. |
Jan 1988 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
59-25826 |
Sep 1984 |
JPX |
Non-Patent Literature Citations (1)
Entry |
T. J. Henman "Melt Stabilization of Polypropylene" 39,76 to 83 of Developments in Polymer Stabilization-1, Gerald Scot, ed. (1979). |
Continuations (1)
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Number |
Date |
Country |
Parent |
893639 |
Aug 1986 |
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