Patent ID: 8604140

Claim:
A method for preventing fouling in chemical equipment, comprising adding an antifouling agent which comprises a polyoxyalkylene polymer represented by the following general Formula (1) or the following general formula (13) and having a number average molecular weight of 30,000 or less to a component in the chemical equipment:, wherein, in the general formula (1), A represents a group in which olefins having 2 to 20 carbon atoms are homopolymerized or copolymerized and which has a number average molecular weight of from 400 to 10,000; R 1 and R 2 each represents a hydrogen atom or an alkyl group having 1 to 18 carbon atoms; and X 1 and X 2 , which may be the same or different, each represents a group represented by the following general formula (2) or the following general formula (4): -E-X 3 (2) wherein, in the general formula (2), E represents an oxygen atom or a sulfur atom; and X 3 represents a polyalkylene glycol group or a group represented by the following general formula (3): —R 3 -(G) m (3) wherein, in the general formula (3), R 3 represents a hydrocarbon group having a valency of m+1; G may be the same or different and represents a group of —OX 4 or —NX 5 X 6 , wherein X 4 , X 5 , and X 6 each represents a polyalkylene glycol group; and m is the bonding number of G and is an integer in a range of from 1 to 10: wherein, in the general formula (4), X 7 and X 8 , which may be the same or different, each represents a polyalkylene glycol group or a group represented by the general formula (3′): —R 3′ -(G′) m′ (3′) wherein, in the general formula ( 3 ′), R 3′ represents a hydrocarbon group having a valency of m′+ 1 ; G′ may be the same or different and represents a group of —OX 4′ or —NX 5′ X 6′ , wherein X 4′ , X 5′ , and X 6′ each represents a polyalkylene glycol group; and m′ is the bonding number of G′ and is an integer in a range of from 1 to 10, wherein, in the general formula (13), A 101 represents a group in which olefins having 2 to 20 carbon atoms are homopolymerized or copolymerized and which has a number average molecular weight of from 500 to 10,000; R 101 and R 102 each represents a hydrogen atom or an alkyl group having 1 to 18 carbon atoms; one of X 101 or X 102 represents a hydrogen atom, a group represented by the following general formula (14), or a group represented by the following general formula (15), and the other represents a group represented by the following general formula (16): -E 101 -R 104 (14) wherein, in the general formula(14), E 101 represents an oxygen atom or a sulfur atom, and R 104 represents a hydrogen atom, a hydrocarbon group, or an acyl group: wherein, in the general formula(15), R 105 and R 106 , which may be the same or different, each represents a hydrocarbon group: -E 102 -X 104 (16) wherein, in the general formula(16), E 102 represents an oxygen atom or a sulfur atom, and X 104 represents a polyalkylene glycol group.