Patent ID: 9245815
Filing Date: 2016-01-26
CPC Classification: C08L,C09J,H01L

Claim Text:
1. An underfill material comprising: epoxy material; and a copolymer including an epoxy-philic block and an epoxy-phobic block, wherein the epoxy-philic block is miscible in the epoxy material, the epoxy-phobic block is covalently bonded with the epoxy-philic block, the epoxy-phobic block is separated in a microphase domain within the epoxy material and the epoxy-philic block is configured to restrict thermal expansion or contraction of the epoxy material wherein the copolymer is comprised of the epoxy-philic block and the epoxy-phobic block selected from one of each group consisting of (a) the epoxy-philic block is polyethylene oxide (PEO) and the epoxy-phobic block is selected from the group consisting of poly(nbutyl-acrylate) (PnBA), poly(styrene) (PS), polypropylene oxide (PPO), polyethylene (PE), poly(hexylmethacrylate) (PHMA), and styrene-ethylene/butylene-styrene (SEBS), (b) the epoxy-philic block is polymethyl methacrylate (PMMA) and the epoxy-phobic block is selected from the group consisting of PEP, PnBA, PS, PBD, PPO, PE, poly(butyleneoxide) (PBO), PHMA, and SEBS, (c) the epoxy-philic block is poly(glycidyl methacrylate) (PGMA) and the epoxy-phobic block is selected from the group consisting of PEP, PnBA, PS, PBD, PPO, PE, polyisoprene (PI), PBO, PHMA, and SEBS, (d) the epoxy-philic block is poly(2-vinyl pyridine) (P2VP) and the epoxy-phobic block is selected from the group consisting of PEP, PnBA, PS, PBD, PPO, PE, PI, PBO, PHMA, and SEBS, (e) the epoxy-philic block is poly(caprolactone) (PCL) and the epoxy-phobic block is selected from the group consisting of PEP, PnBA, PS, PBD, PPO, PE, PI, PBO, PHMA, and SEBS, or (f) the epoxy-philic block is polyacrylic acid (PAA) and the epoxy-phobic block is selected from the group consisting of PEP, PnBA, PS, PBD, PPO, PE, PI, PBO, PHMA, and SEBS.