A heat-curable polymer paste comprising: (i) 100 parts by weight of a transparent polyester resin having a hydroxyl value of 1 to 10 mgKOH/g and a glass transition point (Tg) of 40 to 120° C., (ii) 1 to 30 parts by weight of a crosslinking agent comprising methoxymethyl imino melamine represented as formula (I); (C
2
N
3
)[—N(H)(CH
2
OCH
3
)]
n
[—N(CH
2
OCH
3
)
2
]
3-n
(I) wherein n is 1 to 3, and (iii) 50 to 200 parts by weight of an organic solvent.
PHOSPHORUS NITROGEN FLAME RETARDANT, METHOD THEREOF AND MATERIAL COMPRISING THE SAME
申请人:ZHOU Chongfu
公开号:US20220127533A1
公开(公告)日:2022-04-28
Provided are phosphorus nitrogen flame retardants represented by Formula III, a method of preparing the flame retardants without using any solvent, and various materials comprising the flame retardants. Rb and Rc are independently of each other selected from hydrogen, substituted or unsubstituted alkyl such as C1-C18 alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocyclic alkyl, substituted or unsubstituted heterocycles, substituted or unsubstituted aryl such as C6˜C18 aryl, substituted or unsubstituted heteroaryl such as C3˜C18 heteroaryl, and acyl radical. The invention exhibits numerous technical merits such as excellent flame retardant efficacy, good compatibility with polymers, lower migration to material surface, excellent hydrolysis resistance, low smoke and low toxicity during burning, simpler preparation process, fewer by-products, shorter reaction time, higher yield, and no environmental impact, among others.