Patent ID: 6087418
Filing Date: 2000-07-11
Classification: C04B

Abstract:
A cement composition, comprising cement, a cement admixture, and water, wherein the cement admixture includes the following essential components:either or both of polymer (A) and polymer salt (AA), wherein polymer (A) includes constitutional unit (I) of general formula (1) below as an essential constitutional unit, and polymer salt (AA) is obtained by further neutralizing polymer (A) with an alkaline substance; andeither or both of polymer (B) and polymer salt (BB), wherein polymer (B) includes constitutional unit (II) of general formula (2) below as an essential constitutional unit, and polymer salt (BB) is obtained by further neutralizing polymer (B) with an alkaline substance;wherein general formula (1) is ##STR8## and general formula (2) is ##STR9## wherein: each of R.sup.1 O and R.sup.3 O denotes one kind of oxyalkylene group with 2 to 18 carbon atoms or a mixture of two or more kinds thereof, wherein the mixture may be formed by either block addition or random addition; each of m and n is an average molar number of addition of the oxyalkylene groups and denotes a positive number of 1 or more; and each of R.sup.2 and R.sup.4 denotes a hydrocarbon group with 1 to 30 carbon atoms.