Protecting agent for concrete, masonry surface, bricks, clay roofing, tiles, marble, granite, concrete slate, stucco, paving stones, unglazed ceramic, sandstone, limestone, wood and other objects against stains, dirt, water and oil penetration

A protected construction material having a surface which is water and oil repellent and resistant to staining, said surface having a dry deposit comprising crystal particles derived from a non-siliceous fluorocarbon polymer characterized by the presence of fluorocarbon units of up to 6 carbon atoms, wherein said non-siliceous fluorocarbon polymer is a fluorine-containing polymer having an aliphatic monocyclic structure in the polymer trunk chain, which has a number average molecular weight of from 500 to 1,000,000 and is represented by the formula:

• (Ma):
• -(M1)-(M2a)-(N)— (Ma)
• in which the structural unit M1 is a structural unit derived from an ethylenic monomer having 2 or 3 carbon atoms and at least one fluorine atom, the structural unit M2a is at least one structural unit which introduces an aliphatic monocyclic structure in the polymer trunk chain and is represented by the formula:
• wherein R1 is at least one hydrocarbon group selected from the group consisting of a divalent hydrocarbon group which has 1 to 8 carbon atoms and constitutes a ring (which may be further substituted with a hydrocarbon group or a fluorine-containing alkyl group) and a divalent hydrocarbon group having ether bond which has the sum of carbon atoms and oxygen atoms of 2 to 8 and constitutes a ring (which may be further substituted with a hydrocarbon group or a fluorine-containing alkyl group);
• R2 is an alkylene group which has 1 to 3 carbon atoms and constitutes a ring;
• R3 and R4 are the same or different and each is a divalent alkylene group having 1 or 2 carbon atoms;
• n1, n2 and n3 are the same or different and each is 0 or 1, the structural unit N is a structural unit derived from a monomer copolymerizable with the monomers to introduce the structural units M1 and M2a;
• (Z)n4 is H or each Z is the same or different and each is:
• —(R5)n5Z1
• wherein Z1 is at least one functional group selected from the group consisting of OH group, COOH group, a derivative of carboxylic acid group and a functional group protected by a protective group which can convert the functional group to OH group by reaction with an acid;
• R5 is a divalent organic group;
• n5 is 0 or 1;
• n4 is an integer of from 1 to 3, and wherein the structural units M1, M2a and N are contained in amounts of from 1 to 99% by mole, from 1 to 99% by mole and from 0 to 98% by mole, respectively.