Flame retardant intumescent polyamides comprising repeating structural units of the formulas ##STR1## wherein X is independently chloro or bromo, and n and n' are each independently a positive integer are disclosed.
Flame retardant intumescent polyamide from haloamide
申请人:The Dow Chemical Co.
公开号:US04297475A1
公开(公告)日:1981-10-27
Flame retardant intumescent polyamides comprising repeating structural units of the formulas ##STR1## wherein X is independently chloro or bromo, and n and n' are each independently a positive integer are disclosed.
Preparation of N-halo .alpha.,.alpha.-disubstituted .beta.-lactams
申请人:The Dow Chemical Company
公开号:US04321193A1
公开(公告)日:1982-03-23
A process for preparing N-halo .alpha.,.alpha.-disubstituted .beta.-lactams comprising reacting a 3-halo 2,2-bis(halomethyl) propionamide with a sufficient amount of an aqueous solution of a hypohalite to form the corresponding N-halo 3,3-bis-(halomethyl)-2-azetidinone.