The alkyl group indicates an alkyl group having 1 to 4 carbon atoms.

The long chain N-alkyl group is a C8-C16 alkyl group.

  Examples of the hydrophobic group may include a long chain alkyl group and a cyclic alkyl group.

R is an alkyl group, R' is hydrogen or alkyl and R'' is hydrogen, alkyl or another group.

Thiadiazine compounds of the formula (I) (FORMULA) wherein R1 is alkyl, R2 is alkyl, cycloalkyl, alkenyl or aryl, R3 is alkyl and R4 is alkyl, are useful as insecticides.

Formula (IB)

In formula (IB), R1a is an alkyl group, etc., R2 is an amino group, etc., R3 is a halogen atom, alkyl group, etc., R4 is a cyano group, etc., R5 is an alkyl group, etc., and R6 is an alkyl group, etc.

R1 may be a substituted or unsubstituted alkyl, arylalkyl or aryloxy group, and R2 may be an alkyl group, preferably a C¿1?-C3 lower alkyl group.

Here, an alkyl group having 1 to 4 carbon atoms is preferable in the alkyl group.

R5 represents a C1-8 unsubstituted alkyl group or an alkyl group substituted by an aromatic or heterocyclic group.

R3 represents an alkyl group or an aryl group.

R2 is an alkyl group or alkylene group.

CH2=CH-R (1) (In the formula, R represents a secondary alkyl group, a tertiary alkyl group or an alicyclic hydrocarbon group.)

In these polymers, R1 represents a C10-C12 alkyl group and R2 represents a C1-C4 alkyl group.

Y is an alkyl group or hydroxyl group.