Patent ID: 8900205

Claim:
A syringe for prefilled syringe comprising: a plunger in which a gasket is attached to a top; and a syringe barrel in which the plunger is slidably stored, wherein the syringe barrel includes an inner wall subjected to surface modification with a polymer containing zwitterion, wherein the polymer containing zwitterion is at least one selected from the group consisting of the following chemical formula (2) and chemical formula (3): wherein X 1 , X 2 , Y 1 and Y 2 are each independent; X 1 and X 2 are hydrogen atom or methyl group; Y 1 and Y 2 are —C(O)O— or —C(O)NH—; n1 and n2 which are a polymerization degree are each independent; n1 is an integer of 1 to 100,000; n2 is an integer of 1 to 100,000; and R 1 and R 2 each independently represent a betaine group shown in the following formula (1): *-A 1 -L-A 2 formula (1) wherein A 1 and A 2 are each independent; A 1 is a quaternary ammonium ion ((—(R x )—N(R y ) 2 (R z )—) + ), and wherein R x represents an alkylene group having 1 to 6 carbon atoms, R y independently represents an alkyl group having 1 to 6 carbon atoms, and R z represents a single bond binding to linker group; A 2 is at least one selected from the group consisting of carboxylate ion (—COO − ), phosphate ion (—OPO 3 2− ), sulfate ion (—OSO 3 − ), and sulfonate ion (—SO 3 − ); L represents an alkylene group having 1 to 6 carbon atoms; wherein X 3 and Y 3 are each independent; X 3 is hydrogen atom or methyl group; Y 3 is —C(O)O— or —C(O)NH—; n1 which is a polymerization degree is an integer of 1 to 100,000; and R 3 represents betaine group shown in the above-described formula (1).