Method for making rubber modified resins

Abstract

Abstract 1. IN A PROCESS FOR THE MANUFACTURE OF RESINS OF THE TYPE WHERE RUBBER PARTICLES OF ALKADIENE RUBBER GRAFTED WITH MONOVINYLIDENE AROMATIC MONOMER AND ALKENE NITRILE MONOMER ARE GENERALLY UNIFORMLY DISPERSED N A MATRIX OF COPOLYMER OF MONOVINYLIDENE AROMATIC MONOMER AND ALKENE NITRILE MONOMER, THE IMPROVEMENT WHICH COMPRISES TTHE STEPS OF: (A) ADMIXING TOGETHER, WHILE MAINTAIINING A TEMPERATURE OF FROM ABOUT 120 TO 180*C. ON A 100 WEIGHT PERCENT TOTAL MIXTURE BASIS (1) FROM ABOUT 50 TO 90 WEIGHT PERCENT OF A FIRST COMPOSITION COMPRISING FROM ABOUT 40 TO 80 WEIGHT PERCENT ON A TOTAL FIRST COMPOSITION BASIS OF A FIRST COPOLYMER OF MONOVINYLIDENE AROMATIC MONOMER/ALKENE NITRILE MONOMER HAVING A WEIGHT AVERAGE MOLECULAR WEIGHT FROM ABOUT 75,000 TO 500,000 WITH THE BALANCE UP TO 100 WEIGHT PERCENT THEREOF BEING MONOMERS SELECTED FROM THE GROUP CONSISTING OF MONOVINYLIDENE AROMATIC MONOMER AND ALKENE NITRILE MONOMER, THE RESPECTIVE WEIGHT RATIO OF MONOVINYLIDENE AROMATIC MONOMER TO ALKENE NITRILE MONOMER IN SAID FIRST COPLYMER AND ALSO IN SAID MONOMSERS RANGING FROM ABOUT 90:10 TO 10:90, SAID FIRST COMPOSITION BEING INITIALLY IN THE PHYSICAL FORM OF A HOMOGENEOUS HOT MELT AND HAVING AN INITIAL TEMPERATURE OF FROM ABOUT 130 TO 180*C. (2) FROM ABOUT 50 TO 10 WEIGHT PERCENT OF A SECOND COMPOSITION COMPRISING FROM ABOUT 30 TO 70 WEIGHT PERCENT ON A TOTAL SECOND COMPOSITION BASIS OF GRAFT COPOLYMER, FROM ABOUT 0.01 TO 50 WEIGHT PERCENT OF A SECOND COPOLYMER OF MONOVINYLIDENE AROMATIC MONOMER/ALKALENE NITRILE MONOMER HAVING A WEIGHT AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 50,000 TO 500,000, FROM ABOUT 70 TO 30 WEIGHT PERCENT OF AN ORGANIC LIQUID HAVING A BOILING POINT IN THE RANGE OF FROM ABOUT 25 TO 150*C. AT ATMOSPHERIC PRESSURE AND FURTHER BEING CHARACTERIZED BY BEING SUBSTANTIALLY NON-CHEMICALLY REACTIVE WITH SAID GRAFT COPOLYMER AND BY CAUSING SAID GRAFT COPOLYMER TO SWELL BY NOT MORE THAN ABOUT 25 PERCENT BY VOLUME, AND FROM ABOUT 0 TO 15 WEIGHT PERCENT OF WATER, SAID GRAFT COPOLYMER HAVING A SUBSTRATE OF AN ALKADIENE ELASTOMER WHOSE GLASS PHASE TRANSITION TEMPERATURE IS BELOW ABOUT -20*C., A SUPERSTRATE OF A COPOLYMER OF MONOVINYLIDENE AROMATIC MONOMER AND ALKENE NITRILE MONOMER, A GRAFT RATIO OF FROM ABOUT 5 TO 75 PARTS BY WEIGHT SUPERSTRATE FOR EACH 100 PARTS BY WEIGHT OF SUBSTRATE, AND A WEIGHT AVERGE PARTICLE SIZE IN THE RANGE OF FROM ABOUT 0.25 TO 2.0 MICRONS, THE RESPECTIVE WEIGHT AVERAGE PARTICLE SIZE AROMATIC MONOMER TO ALKENE NITRILE MONOMER IN SAID SECOND COPOLYMER AND ALSO IN SAID GRAFT COPOLYMER SUPERSTRATE RANGING FROM ABOUT 90:10 TO 10:90, SAID SECOND COMPOSITION BEING INITIALLY IN THE PHYSICAL FORM OF A DISPERSION OF SAID GRAFT COPOLYMER IN SAID ORGANIC LIQUID AND HAVING AN INITIAL TEMPERATURE RANGING FROM ABOUT 0*C. UP TO THE BOILING POINT OF SAID ORGANIC LIQUID, AND (B) PLACING THE SO-ADMIXED SAID FIRST COMPOSOTION AND SAID SECOND COMPOSITION IN A FLASH VAPORIZATION ZONE FOR A TIME OF LESS THAN ABOUT 10 MINUTES, SAID FLASH VAPORIZATION ZONE BEING AT A TEMPERATURE OF FROM ABOUT 120 TO 280*C. AND AT A PRESSURE OF FROM ABOUT 0.001 TO 800 MM. HG ABS. WHILE MAINTAINING SUCH ADMIXTURE IN A PHYSICAL FORM SUCH THAT, FOR A PERIOD OF TIME OF AT LEAST ABOUT 1 MIINUTE IN SAID ZONE, SUCH ADMIXTURES HAS A RATIO OF TOTAL SURFACE AREA TO TOTAL VOLUME THEREOF AT ANY GIVEN TIME OF AT LEAST ABOUT 2.5:1, AND WHILE REMOVING VAPORS EVOLVED FROM SUCH ADMIXTURE IN SAID ZONE, THE COMBINATION OF SUCH CONDITIONS IN SAID ZONE BEING SUCH THAT THE DEVOLATILIZED COMPOSITION THEREAFTER REMOVED FROM SAID ZONE COMPRISES AT LEAST ABOUT 97 WEIGHT PERCENT ON A TOTAL DEVOLATILIZED COMPOSITION BASIS OF COMBINED SAID FIRST AND SAID SECOND COPOLYMERS OF MONVINYLIDENE AROMATIC MONOMER/ALKENE NITRILE MONOMER AND SAID GRAFT COPOLYMER.

Inventors

• 👤 W Dalton

Bibliographic Details