Environmental stress crack resistance of hips

Details Environmental stress crack resistance of hips Environmental stress crack resistance of hips

1994-03-09

1996-08-06

Seidleck, James J.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 78, 525 79, 525 80, 525 83, 525 84, 525 86, C08L 5104, C08L 5502

Patent

active

055434614

ABSTRACT:
High impact polystyrene (HIPS) and other impact modified styrenic polymers such as ABS and MBS tend to suffer from environmental stress cracking. On extended exposure to oily or fatty substances the plastic tends to craze, then crack and finally break. Unfortunately, a number of applications for impact modified polymers is in areas where there is a high potential to contact with oily or fatty substances. The environmental stress crack resistance (ESCR) of impact modified styrenic polymers may be increased by increasing the particle size of the impact modifier and including a low molecular weight polybutene.

REFERENCES:
patent: 4985498 (1991-01-01), Shirodkar
patent: 5331048 (1994-07-01), Hasselbring
"Chevron Polystyrene Extrusion Grade Resins" data sheet, Chevron Chemical Company, (Dec./90).
"Engineered HIPS Grades Become Candidates for ABS Replacement", Karen F. Lindsay, Modern Plastics, (Feb. 1992).
"Enter a New Crop of Enhanced HIPS", Plast. Technol.; 39, No. 6, Jun. 1993, p. 25/7.

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