Microbicidal composition
View Patent ↗An aqueous microbicidal composition having two components. The first component is a nonionic surfactant with structure: R 1 O(CH 2 CH(CH 3 )O) 5 (CH 2 CH 2 O) 9 H, where R 1 is a C 8 alkyl group. The second component is phenoxyethanol. The weight ratio of the nonionic surfactant to phenoxyethanol is from 1:1 to 1:18.2766.
1. A synergistic microbicidal composition comprising: (a) a nonionic surfactant with structure:
R 1 O(CH 2 CH(CH 3 )o) 5 (CH 2 CH 2 O) 9 H
where R 1 is a C 8 alkyl group; and (b) phenoxyethanol; wherein a weight ratio of said nonionic surfactant to phenoxyethanol is from 1:1 to 1:18.2766.
2. The synergistic microbicidal composition of claim 1 in which said C 8 alkyl group is 2-ethylhexyl.
3. A method for inhibiting the growth of microorganisms in an aqueous medium; said method comprising adding to said aqueous medium: (a) a nonionic surfactant with structure:
R 1 O(CH 2 CH(CH 3 )o) 5 (CH 2 CH 2 O) 9 H
where R 1 is a C 8 alkyl group; and (b) phenoxyethanol; wherein a weight ratio of said nonionic surfactant to phenoxyethanol is from 1:1 to 1:18.2766.
4. The method of claim 3 in which said C 8 alkyl group is 2-ethylhexyl.
5. A synergistic microbicidal composition comprising: (a) a nonionic surfactant with structure:
R 2 O(CH 2 CH(CH 3 )o) 3 (CH 2 CH 2 O) x H
where R 2 is a mixture of C 8 -C 14 linear alkyl groups and x is an integer from 5 to 7; and (b) phenoxyethanol; wherein a weight ratio of said nonionic surfactant to phenoxyethanol is from 1:0.1999 to 1:36.5897.
6. The synergistic microbicidal composition of claim 5 in which said mixture of C 8 -C 14 linear alkyl groups comprises from 60 to 75 wt % C 8 -C 10 linear alkyl groups and 25 to 40 wt % C 12 -C 14 linear alkyl groups.
7. The synergistic microbicidal composition of claim 6 in which x is 5.
8. The synergistic microbicidal composition of claim 6 in which x is 7 and said weight ratio is 1:0.7996 to 1:27.4377.
9. A method for inhibiting the growth of microorganisms in an aqueous medium; said method comprising adding to said aqueous medium: (a) a nonionic surfactant with structure:
R 2 O(CH 2 CH(CH 3 )o) 3 (CH 2 CH 2 O) x H
where R 2 is a mixture of C 8 -C 14 linear alkyl groups and x is an integer from 5 to 7; and (b) phenoxyethanol; wherein a weight ratio of said nonionic surfactant to phenoxyethanol is from 1:0.1999 to 1:36.5897.
10. The method of claim 9 in which. said mixture of C 8 -C 14 linear alkyl groups comprises from 60 to 75 wt % C 8 -C 10 linear alkyl groups and 25 to 40 wt % C 12 -C 14 linear alkyl groups.