Formaldehyde → Benzene, ethenyl-, polymer with 1,3-butadiene

Participants

Reaction Steps

Into a reactor equipped with a stirring means, a heating and cooling means and a pipe for supplying starting materials and having an internal capacity of 40 l, 14.7 kg of latex A-1 obtained in Example 1 and 2.5 kg of deionized water were charged, and at a temperature of 40° C., 72 g of acetic anhydride and 1.4 kg of deionized water were added and mixed. After stirring for about 1 minute, the mixture was left to stand for 10 minutes. Then, 30 g of sodium salt of a condensation product of β-naphthalene sulfonic acid with formaldehyde, 110 g of 48% potassium hydroxide and 880 g of deionized water were added and stirred to obtain a butadiene-styrene rubber copolymer latex containing rubber particles having the particle sizes increased. The pH of this latex was 7.5, the solid content was 29.1% by weight, and the average particle size of rubber was 0.25 μm (as measured by the measuring method as mentioned above). The latex thus obtained will be referred to as latex B-2.

Provenance & Evidence