摘要:
A lubricating oil for freezers, which is made of a polyether represented by the general formula (1): R1 —[X—OR4]5, wherein R1 represents an s-valent group having an aromatic nucleus, X represents a divalent group consisting of —OR2— and —OR3— groups (the numbers of which are q and r, respectively, on average), R2 represents an ethylene group which may have a methyl group or ethyl group, R3 represents an ethylene group having an alkoxymethyl group in which the alkoxyl group has 1 to 4 carbon atoms, and R4 represents an alkyl group having 1 to 10 carbon atoms, s is an integer of 1 to 6, q is 0 to 6, r is at least 0.5, and (q+r)×s is 3 to 80, and which has a high compatibility with HFC refrigerant, a high stability to the hydrolisis and a high volume resistivity.
摘要:
The present invention is the following invention which provides a cement admixture which satisfies fluidity of fresh concrete and high strength of the hardened product of concrete simultaneously. Namely, the present invention resides in a cement admixture which is a mixture of fluorine-containing compounds represented by the formula (1): Rf13 Q1—O—(A1—O)k—R1 (1) wherein Rf is a C1-22 polyfluoroaliphatic hydrocarbon group which may contain ethereal oxygen atoms or thioethereal sulfur atoms, Q1 is a C1-5 linear or branched alkylene group, k is an integer of from 1 to 100, A1 is a C2-4 linear alkylene group or a group having at least one hydrogen atom of said alkylene group substituted by a hydrocarbon group which may contain ethereal oxygen atoms, provided that when k is from 2 to 100, the plurality of A1 may be the same or different, and R1 is a hydrogen atom, a C1-18 hydrocarbon group or a C1-18 acyl group, said mixture having a ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) (i.e. Mw/Mn) of at least 1.1, and concrete which contains said cement admixture.
摘要:
The present invention is directed to a method for producing fluorine-containing oxyalkylene compounds used in a cement admixture represented by the formula (4), which comprises ring opening polymerization of at least one cyclic ether represented by the formula (3) in the presence of an acid catalyst and a fluorine-containing hydroxyl compound represented by the formula (2): Rf—Q2—OH (2) Rf—Q2—O—(A2—O)k—H (4) wherein Rf is a C1-22 polyfluoroaliphatic hydrocarbon group which may contain ethereal oxygen atoms or thioethereal sulfur atoms, Q2 is a C3-5 linear or branched alkylene group, k is an integer of from 1 to 100, and A2 is a C2-4 linear alkylene group or a group having at least one hydrogen atom of said alkylene group substituted by a hydrocarbon group which may contain ethereal oxygen atoms.
摘要:
To provide a room-temperature-curable composition which comprises an oxyalkylene polymer containing hydrolyzable silicon groups, which has ensured working time and curing rate required for operation, and which can provide a cured article having good tensile properties.A room-temperature-curable composition comprising a polymer (a1) and a curing catalyst (b), wherein the polymer (a1) is a linear oxyalkylene polymer having at least two hydrolyzable silicon groups of the formula (1), at different molecular terminals: —Si(OR)3 (1) wherein each R independently represents a C1-6 organic group.
摘要:
A silyl group-containing polymer which can be cured quickly and strongly, and from which a cured product excellent in antifouling properties and weather resistance while maintaining favorable rubber elasticity can be obtained, and having the following formula (1): wherein R1: a group having a hydroxyl group(s) removed from a monohydroxy or polyhydroxy compound having t hydroxyl group(s) in its molecule, R2: a bivalent organic group, R3: a C1-20 monovalent organic group which may have a substituent, X: a hydroxyl group or a hydrolysable group, Y: a bivalent group of the following formula (A) or (B), “a”: an integer of from 1 to 3, r: an integer of from 1 to 1,000, and t: an integer of from 1 to 8, provided that when the silyl group-containing polymer of formula (1) has a plurality of Y's in its molecule, the plurality of Y's may be the same or different, and when t is from 2 to 8, a plurality of monovalent groups bonded to R1 may be the same or different: in the formula (A), R4: a C2-8 alkylene group, and in the formula (B), R5: a C2-4 alkylene Group; and its production process.
摘要:
To provide a hardly colored curable composition having an excellent storage stability while maintaining fast curing properties.A curable composition which comprises a polymer (P) having a polyoxyalkylene chain and a group of the following formula (1) and a compound (S) having a mercapto group and a group of the following formula (2), and which contains from 0.01 to 0.50 part by mass of the compound (S) per 100 parts by mass of the polymer (P): —Si(—X1)3 (1) —Si(—X2)m(—Y2)3-m (2) wherein symbols have the following meanings: X1 and X2: each independently a C1-6 alkoxy group, Y2: a C1-6 alkyl group, and m: 1, 2 or 3.
摘要:
To provide a curable composition which has a high curing rate and can provide a cured product having good durability.A curable composition comprising an oxyalkylene polymer (A) having a reactive silicon group represented by the following formula (1), and a quaternary ammonium salt (B): —SiX1aR13-a (1) wherein R1 is a C1-20 monovalent organic group which may have a substituent, X1 is a hydroxyl group or a hydrolyzable group, and a is an integer of from 1 to 3; provided that when plural R1s are present, they may be the same or different from one another, and when plural X1s are present, they may be the same or different from one another.
摘要:
To provide a silyl group-containing polymer which can be cured quickly and strongly, and from which a cured product excellent in antifouling properties and weather resistance while maintaining favorable rubber elasticity can be obtained, and its production process.The silyl group-containing polymer of the present invention is a silyl group-containing polymer represented by the following formula (1): wherein R1 is a group having a hydroxyl group(s) removed from a monohydroxy or polyhydroxy compound having t hydroxyl group(s) in its molecule, R2 is a bivalent organic group, R3 is a C1-20 monovalent organic group which may have a substituent, X is a hydroxyl group or a hydrolysable group, Y is a bivalent group represented by the following formula (A) or a bivalent group represented by the following formula (B), “a” is an integer of from 1 to 3, r is an integer of from 1 to 1,000, and t is an integer of from 1 to 8, provided that when the silyl group-containing polymer represented by the formula (1) has a plurality of Y's in its molecule, the plurality of Y's may be the same or different, and when t is from 2 to 8, a plurality of monovalent groups bonded to R1 may be the same or different: in the formula (A), R4 is a C2-8 alkylene group, and in the formula (B), R5 is a C2-4 alkylene group.
摘要:
A hot melt adhesive composition employing a thermoplastic polyurethane, which has a high adhesive strength even under bonding conditions of low temperature and short time or even to nylon cloth, and which has a favorable adhesive strength in a wide temperature range of from room temperature to low temperature. A hot melt adhesive composition comprising a thermoplastic polyurethane (A) having a flow initiation temperature of from 80 to 150° C. and a phenolic hydroxy group-containing compound (B) having phenolic hydroxy groups and having a molecular weight of at least 1,000.
摘要:
To provide a curable composition excellent in storage stability.To produce an oxyalkylene polymer (P) having a urethane bond, a polyoxyalkylene chain and an alkoxysilyl group, which comprises subjecting a polymer (pP) having a polyoxyalkylene chain and a hydroxyl group and a compound (U) having an alkoxysilyl group and an isocyanate group, to a urethanization reaction in the presence of a double metal cyanide complex catalyst having an organic ligand, and to provide a curable composition containing the polymer.