Eliminating odor/taste-producing substances in plastic materials

Details Eliminating odor/taste-producing substances in plastic materials Eliminating odor/taste-producing substances in plastic materials

1993-12-20

1995-07-25

Hoke, Veronica P.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

138174, 2065241, 2065243, 2065246, 524450, C08K 334

Patent

active

054362822

ABSTRACT:
A process for eliminating in plastic materials odor/taste-producing substances is described, the plastic material especially having the shape of water pipes, plastic containers or plastic film/sheeting for packing foodstuffs and pharmaceutical preparations, or interior fittings of plastic. In the process, there is added, during processing in the molten state, less than 0.5 wt.-%, preferably 0.05-0.3 wt.-%, of a substantially 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, preferably 200-500, and a sorption capacity for water at 25.degree. C. and 4.6 torr of less than 10 wt.-%, to the plastic material which subsequently is formed. The molecular sieve preferably has an average particle size not exceeding about 5 .mu.m. The plastic material is a polyolefin plastic and is preferably selected among ethylene plastics and propylene plastics.

REFERENCES:
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patent: 4591653 (1986-05-01), Suzuki et al.
patent: 4795482 (1989-01-01), Gioffre et al.
patent: 4826497 (1989-05-01), Marcus et al.
patent: 4855154 (1989-08-01), Gioffre et al.
patent: 4910295 (1990-03-01), Bernier et al.
patent: 5013335 (1991-05-01), Marcus

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