Multistage process for production of graft modified olefin polymers useful for adhesive coatings on metallic and other surfaces, compatibility improver in polymer molding compositions, and reactive coupling agent in polymer composites

摘要

A multistage process for production of graft modified olefin polymers of functionality 0.1-5 wt.% involves: (i) heating reaction mixture containing olefin polymer, butyl acrylate (BA) and peroxide; (ii) reacting of BA or BA/comonomer mixture; (iii) adding maleic acid anhydride (MAA) or MAA mixture, and heating; (iv) blowing with nitrogen; (v) removing unreacted monomer; and (vi) cooling and removing the product. A multistage process for production of graft modified olefin polymers of functionality 0.1-5 wt.% involving: (i) heating reaction mixture containing (wt.%): particulate olefin polymer or olefin polymer blend (60-97) of mean particle diameter 0.01-8 mm, butyl acrylate (BA)(2-24) or BA/comonomer mixture in weight ratio at least 1 part BA per part comonomer, organic peroxide (1-16) or a mixture of at least two organic peroxides of half life 2-150 minutes at a selected reaction temperature (TR1 and TR2) as radical former, weight ratio of BA or BA/comonomer mixture to radical former 0.2-20, dispersion temperature TD1 between room temperature TN and 60 degreesC, dispersion time 1-150 minutes; (ii) heating the mixture within a time tA1 of 5-200 minutes from the dispersion temperature TD1 to the reaction temperature TR1 of 60-130 degreesC, (iii) reacting BA or the BA/comonomer mixture at TR1 of 60-130 degreesC within a reaction time tR1 of 5-300 minutes with maintenance of a solid (dry) consistency in the reaction mixture, and after a monomer conversion of 50-99% in a second state; (iv) adding maleic acid anhydride (MAA) or MAA/comonomer mixture corresponding to a composition MAA (20-95)/comonomer (5-80) at a temperature in the TR1 region, with dispersion within a time tD2 of 1-150 minutes; (v) after a heating time tA2 of 5-200 minutes, heating to a reaction temperature TR2 of 100-160 degreesC; and (vi) reaction with maintenance of TR2 with the reaction time tR2 of 5-300 minutes and the reaction mixture in the solid (dry) state; (vii) removing unreacted monomer from the reaction mixture which is blown with nitrogen over a desorption time tdes of 20-240 minutes and a desorption temperature TDes between reaction temperature TR2 and 80 degreesC, the residual initiator is deactivated and after cooling to a final temperature between 80 degreesC and room temperature TN the dry graft modified olefin polymer or olefin polymer blend is removed.