Mixtures of cellulose ethers, used as protective colloid in emulsion polymerization, e.g. copolymerization of vinyl acetate with higher ester, contains ethers with polyalkylene oxide chains, some modified with terminal allyl groups

摘要

Mixtures of cellulose ethers are based on cellulose ethers (I) with 50-500 anhydroglucose units (AGU) and a chain of 0-4 ethyleneoxy, 0-4 propylene-2-oxy and 0-4 2-hydroxypropylene-1-oxy groups to an average of over 1.3 and under 4.5 polyalkylene oxide chains per AGU. The mixtures contain (A) allyl-modified (I) with 0.01-0.1 allyl groups per AGU and (B) unmodified (I) in an A:B weight ratio of 1:99 to 99:1. Mixtures of cellulose ethers contain (A) allyl-modified cellulose ethers of formula (1), with an average of 0.01-0.1 allyl groups per anhydroglucose unit (AGU), and (B) cellulose ethers of formula (1) in an A:B weight ratio of 1:99 to 99:1: C6H7O2 = one AGU; n = 50-500; R1, R2, R3 = a polyalkylene oxide chain of formula (2) with oxyalkylene units in any sequence; X = H, CH3, C2H5 in (A) and (B) or, in (A) only, CH2HC=CH2; p, q, r = 0-4; (p+q+r) = over 1.3 and under 4.5 on average per AGU .