Claims
- 1. A process for reducing emission of odor/taste producing substances originating from plastic materials; said method including the steps of:
- (a) providing, during processing, plastic material in a molten state; said plastic material being selected from the group consisting essentially of: ethylene plastics, propylene plastics and mixtures thereof;
- (b) adding to the plastic material in the molten state an odor/taste emission reducing effective amount of hydrophobic aluminum silicate molecular sieve having: a pore diameter of at least 5.5 .ANG.; an Si/Al molar ratio in the crystal lattice of at least 35; and, a sorption capacity for water at 25.degree. C. and 4.6 torr of less than 10% by weight;
- (i) the molecular sieve being provided in the molten plastic material in an amount not greater than 0.5% by weight; and
- (c) mixing the plastic material and the molecular sieve and uniformly distributing the molecular sieve in the molten plastic material.
- 2. A process according to claim 1 wherein:
- (a) said step of adding aluminum silicate molecular sieve comprises adding sieve having: an Si/Al molar ratio in the crystal lattice of between 200 and 500; and, a sorption capacity for water at 25.degree. C. and 4.6 torr of less than 6% by weight.
- 3. A process according to claim 2 wherein:
- (a) said step of adding molecular sieve comprises adding sieve having an average particle size not exceeding 5 .mu.m.
- 4. A process according to claim 1 wherein:
- (a) said step of adding molecular sieve comprises adding sieve having an average particle size not exceeding 5 .mu.m.
- 5. A process according to claim 4 wherein:
- (a) said step of adding molecular sieve comprises adding molecular sieve in an amount of 0.05-0.3% by weight.
- 6. A process according to claim 1 wherein:
- (a) said step of adding molecular sieve comprises adding molecular sieve in an amount of 0.05-0.3% by weight.
- 7. A process for preparing a plastic pipe material exhibiting low emission of odor/taste-producing substances that originate from the plastic material; said method including the steps of:
- (a) providing, during processing, plastic material in a molten state; said plastic material being selected from the group consisting essentially of: ethylene plastics, propylene plastics and mixtures thereof;
- (b) adding to the plastic material, in the molten state, an odor/taste emission reducing effective amount of hydrophobic aluminum silicate molecular sieve having: a pore diameter of at least 5.5 .ANG.; an Si/Al molar ratio in the crystal lattice of at least 35; and, a sorption capacity for water at 25.degree. C. and 4.6 torr of less than 10% by weight;
- (i) the molecular sieve being provided in the molten plastic material in an amount not greater than 0.5% by weight;
- (c) mixing the plastic material and the molecular sieve and uniformly distributing the molecular sieve in the molten plastic material; and
- (d) after the steps of adding the molecular sieve to the plastic material and mixing and uniformly distributing the molecular sieve in the plastic material, forming the plastic material into a pipe.
- 8. A process according to claim 7 wherein:
- (a) said step of adding aluminum silicate molecular sieve comprises adding sieve having: an Si/Al molar ratio in the crystal lattice of between 200 and 500; and, a sorption capacity for water at 25.degree. C. and 4.6 torr of less than 6% by weight.
- 9. A process according to claim 7 wherein:
- (a) said step of adding molecular sieve comprises adding molecular sieve in an amount of 0.05-0.3% by weight.
- 10. A process for preparing film or sheeting from plastic material that exhibits low emission of odor/taste producing substances originating from the plastic material; said process including the steps of:
- (a) providing, during processing, plastic material in a molten state; said plastic material being selected from the group consisting essentially of: ethylene plastics, propylene plastics and mixtures thereof;
- (b) adding to the plastic material, in the molten state, an odor/taste emission reducing effective amount of hydrophobic aluminum silicate molecular sieve having: a pore diameter of at least 5.5 .ANG.; an Si/Al molar ratio in the crystal lattice of at least 35; and, a sorption capacity for water at 25.degree. C. and 4.6 torr of less than 10% by weight;
- (i) the molecular sieve being provided in the molten plastic material in an amount not greater than 0.5% by weight;
- (c) mixing the plastic material and the molecular sieve and uniformly distributing the molecular sieve in the molten plastic material; and
- (d) after the steps of adding the molecular sieve to the plastic material and mixing and uniformly distributing the molecular sieve in the plastic material, forming the plastic material into a film or sheeting.
- 11. A process according to claim 10 wherein:
- (a) said step of adding aluminum silicate molecular sieve comprises adding sieve having: an Si/Al molar ratio in the crystal lattice of between 200 and 500; and, a sorption capacity for water at 25.degree. C. and 4.6 torr of less than 6% by weight.
- 12. A process according to claim 10 wherein:
- (a) said step of adding molecular sieve comprises adding molecular sieve in an amount of 0.05-0.3% by weight.
- 13. A process for preparing a plastic bottle or container from plastic material that exhibits low emission of odor/taste-producing substances originating from the plastic material; said process including the steps of:
- (a) providing, during processing, plastic material in a molten state; said plastic material being selected from the group consisting essentially of: ethylene plastics, propylene plastics and mixtures thereof; and
- (b) adding to the plastic material, in the molten state, an odor/taste emission reducing effective amount of hydrophobic aluminum silicate molecular sieve having: a pore diameter of at least 5.5 .ANG.; an Si/Al molar ratio in the crystal lattice of at least 35; and, a sorption capacity for water at 25.degree. C. and 4.6 torr of less than 10% by weight;
- (i) the molecular sieve being provided in the molten plastic material in an amount not greater than 0.5% by weight;
- (c) mixing the plastic material and the molecular sieve and uniformly distributing the molecular sieve in the molten plastic material; and
- (d) after the steps of adding the molecular sieve to the plastic material and mixing and uniformly distributing the molecular sieve in the plastic material, forming the plastic material into a bottle or container.
- 14. A process according to claim 13 wherein:
- (a) said step of adding aluminum silicate molecular sieve comprises adding sieve having: an Si/Al molar ratio in the crystal lattice of between 200 and 500; and, a sorption capacity for water at 25.degree. C. and 4.6 torr of less than 6% by weight.
- 15. A process according to claim 13 wherein:
- (a) said step of adding molecular sieve comprises adding molecular sieve in an amount of 0.05-0.3% by weight.
- 16. A process for preparing a plastic interior fitting for a building or car from plastic material that exhibits low emission of odor/taste-producing substances originating from the plastic material; said process including the steps of:
- (a) providing, during processing, plastic material in a molten state; said plastic material being selected from the group consisting essentially of: ethylene plastics, propylene plastics and mixtures thereof; and
- (b) adding to the plastic material, in the molten state, an odor/taste emission reducing effective amount of hydrophobic aluminum silicate molecular sieve having: a pore diameter of at least 5.5 .ANG.; an Si/Al molar ratio in the crystal lattice of at least 35; and, a sorption capacity for water at 25.degree. C. and 4.6 tort of less than 10% by weight;
- (i) the molecular sieve being provided in the molten plastic material in an amount not greater than 0.5% by weight;
- (c) mixing the plastic material and the molecular sieve and uniformly distributing the molecular sieve in the molten plastic material; and
- (d) after the steps of adding the molecular sieve to the plastic material and mixing and uniformly distributing the molecular sieve in the plastic material, forming the plastic material into a car or building interior fitting.
- 17. A process according to claim 16 wherein:
- (a) said step of adding aluminum silicate molecular sieve comprises adding sieve having: an Si/Al molar ratio in the crystal lattice of between 200 and 500; and, a sorption capacity for water at 25.degree. C. and 4.6 torr of less than 6% by weight.
- 18. A process according to claim 16 wherein:
- (a) said step of adding molecular sieve comprises adding molecular sieve in an amount of 0.05-0.3% by weight.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9100181 |
Jan 1991 |
SEX |
|
Parent Case Info
This is a continuation of application Ser. No. 07/941,080, filed Oct. 9, 1992 now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (4)
Number |
Date |
Country |
348978 |
Mar 1990 |
EPX |
60-92379 |
May 1985 |
JPX |
2-209943 |
Aug 1990 |
JPX |
2-265961 |
Oct 1990 |
JPX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
941080 |
Oct 1992 |
|