Reference

Chronic pulmonary function loss from exposure to toluene diisocyanate

Chronic pulmonary function loss from exposure to toluene diisocyanate. Wegman, D. H.; Peters, J. M.; Pagnotto, L.; Fine, L. J. (Div. Occup. Hyg., Dep. Labor Ind., Boston, Mass., USA). Br. J. Ind. Med., 34(3), 196-200 (English) 1977. CODEN: BJIMAG. DOCUMENT TYPE: Journal CA Section: 59 (Air Pollution and Industrial Hygiene) Section cross-reference(s): 25, 36 Redetn. after 2 y of FEV (an index of ventilatory capacity) in 57 workers exposed to TDI [26471-62-5] in polyurethane foam manuf. showed that only the least exposed group (￡0.0015 ppm) showed normal 2-y declines in FEV. FEV in the most exposed group (30.0035 ppm) decreased 206 mL in 2 y, exceeding the expected decrease by 3-4 fold. The decrease in FEV in the middle group (0.002-0.003 ppm) was borderline (42 mY). The relation of FEV to exposure was not explained by age, length of service, smoking habits, or variables related to lung size. There was a significant assocn. between acute and chronic decrement in FEV. Chronic occupational exposure to 30.003 ppm TDI is unsafe.

Removal of unreacted tolylene diisocyanate from urethane prepolymers

Removal of unreacted tolylene diisocyanate from urethane prepolymers. Marans, Nelson Samuel; Gluecksmann, Alfred (Grace, W. R., and Co., USA). U.S. US 4061662 6 Dec 1977, 5 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C07C119-042. NCL: 560026000. APPLICATION: US 75-608498 28 Aug 1975. DOCUMENT TYPE: Patent CA Section: 36 (Plastics Manufacture and Processing) Unreacted TDI [26471-62-5] is removed from a polyisocyanate by contacting the polyisocyanate with mol. sieves. Thus, a polyethylene glycol-TDI copolymer [9042-77-7] with a residual TDI content of 0.9% was passed in five fractions through a column packed with X-type mol. sieves at 70-5° to give 0.3 ± 0.1% residual TDI, a redn. of 67%. No appreciable viscosity change was obsd.