Claims
- 1. A polymer composition comprising a propylene polymer having a melt flow index in the range from 4 to 120 decigrams/minute, di-t-amyl peroxide, and at least one decomposition product of said peroxide, whereby said composition has agreeable odor characteristics.
- 2. The composition of claim 1 wherein the propylene polymer is selected from the group consisting of homopolymeric polypropylene and copolymers of propylene with other copolymerizable monomers wherein greater than about 50% by weight of the copolymer is comprised of propylene moieties.
- 3. The composition of claim 2 wherein the propylene polymer is homopolymeric polypropylene.
- 4. The composition of claim 2 wherein the propylene polymer is a copolymer of propylene and at least one comonomer selected from the group consisting of ethylene, butylene, and 4-methyl-pentene-1.
- 5. The composition of claim 1 wherein at least one decomposition product of di-t-amyl peroxide is t-amyl alcohol.
- 6. The composition of claim 1 wherein the di-t-amyl peroxide is present in a range of from 200 to 2000 parts by weight per million parts by weight of the propylene polymer.
- 7. A method of manufacturing a shaped article comprising the steps of:
A) mixing a propylene polymer having a melt flow index in the range from 1 to 20 decigrams/minute with a vis-breaking amount of di-t-amyl peroxide, B) heating the mixture at a temperature effective to decompose the di-t-amyl peroxide until the melt flow index is in the range of from 4 to 120 decigrams/minute, and C) shaping an article comprising a mixture comprising the propylene polymer having a melt flow index in the range from 4 to 120 decigrams/minute, di-t-amyl peroxide, and decomposition products of said peroxide, whereby said article has agreeable odor characteristics.
- 8. The method of claim 7 wherein the propylene polymer is selected from the group consisting of homopolymeric polypropylene and copolymers of propylene with other copolymerizable monomers wherein greater than about 50% by weight of the copolymer is comprised of propylene moieties.
- 9. The method of claim 8 wherein the propylene polymer is homopolymeric polypropylene.
- 10. The method of claim 8 wherein the propylene polymer is a copolymer of propylene and at least one comonomer selected from the group consisting of ethylene, butylene, and 4-methyl-pentene-1.
- 11. The method of claim 7 wherein at least one decomposition product of di-t-amyl peroxide is t-amyl alcohol.
- 12. The method of claim 7 wherein the di-t-amyl peroxide is present in a range of from 200 to 2000 parts by weight per million parts by weight of the propylene polymer.
- 13. In a method for producing a controlled rheology propylene polymer, the improvement that comprises employing a vis-breaking amount of t-amyl peroxide to generate free radicals and produce t-amyl alcohol, whereby the pleasantness of the organoleptic qualities of the polymer is increased.
Parent Case Info
[0001] I claim the benefit under Title 35, United States Code, § 120 to U.S. Provisional Application No. 60/222,857, filed Aug. 4, 2000, entitled PROPYLENE POLYMER HAVING AGREEABLE ODOR CHARACTERISTICS AND SHAPED ARTICLES THEREOF.
Provisional Applications (1)
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Number |
Date |
Country |
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60222857 |
Aug 2000 |
US |