Title: Process for preparing polycarbodiimide foams in the presence of phosphetane oxide or sulfide adducts

Abstract: A compound adapted to be used to advantage as a catalyst for making carbodiimide foams is prepared by a process wherein A. a phosphetane oxide or phosphetane sulphide of the general Formulae I and II: ##EQU1## wherein X represents a C.sub.1 -C.sub.18 alkyl, C.sub.2 -C.sub.18 alkenyl, C.sub.6 -C.sub.14 aryl, C.sub.7 -C.sub.20 aralkyl, C.sub.1 -C.sub.18 alkoxy or C.sub.6 -C.sub.14 aroxy group and R.sup.1 to R.sup.6 represent hydrogen and/or C.sub.1 -C.sub.4 alkyl groups and is reacted with B. a mono-, di- and/or polyhydric alcohol having a molecular weight of about 32 to about 250, a protonic acid which has a pH of between 1 and 8 in N/10 aqueous solution, a metal salt or an acid chloride.

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Other info:

Inventors: La Spina, Andrea (Garbagnate Milanese, IT)
Dietrich, Werner (Cologne, DT)
Schliebs, Reinhard (Cologne, DT)

Application Number: 498788
Filing Date: 1974-08-19
Publication_date: 1976-01-06
Assignee: Bayer Aktiengesellschaft (Leverkusen Bayerwerk, DT)
Primary Class(es): 521/108 521/155, 521/160, 521/170, 521/901, 521/902, 556/14, 556/20, 556/21, 556/23, 556/174, 568/14, 987/33
Other Classes:
US Patent Ref:

3657161	Apr, 1972	Bernard et al.	260/2.
3717596	Feb, 1973	Kan et al.	260/2.
3723364	Mar, 1973	McLaughlin et al.	260/2.
3723366	Mar, 1973	Kan	260/2.
3728289	Apr, 1973	Reuter et al.	260/2.
3746709	Jul, 1973	Patton et al.	260/2.
3766103	Oct, 1973	Patton et al.	260/2.

Other Refs:
Primary Examiner: Cockeram, H. S.
Assistant Examiner:
Attorney: Gil; Joseph C.