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EC number: 201-297-1
CAS number: 80-62-6
At pH 3, 14C-methyl methacrylate was stable to hydrolysis
Only few hydrolysis occured at pH 7.
Kinetic parameters of hydrolysis at pH 11 are as follows:
% 14 C-Methyl methacrylate
Hour 0 pH ll A
Hour 0 pH ll B
Hour 0 pH ll C
Hour 1 pH ll A
Hour 1 pH ll B
Hour 1 pH ll C
Hour 2 pH ll A
Hour 2 pH ll B
Hour 2 pH ll C
Hour 3 pH ll A
Hour 3 pH ll B
Hour 3 pH ll C
Hour 4 pH ll A
Hour 4 pH ll B
Hour 4 pH ll C
Hour 5 pH ll A
Hour 5 pH ll B
Hour 5 pH ll C
Hour 6 pH ll A
Hour 6 pH ll B
Hour 6 pH ll C
Hour 7 pH ll A
Hour 7 pH ll B
Hour 7 pH ll C
Hour 8 pH ll A
Hour 8 pH ll B
Hour 8 pH ll C
Hydrolysis as a function of pH was tested acc. EPA OTS 796 3500 at pH 3,
7 and 11 at 25 °C with radiolabelled 14C- Methyl methacrylate was stable
within 28 days at pH 3. Hydrolysis half-life of MMA at pH 7 and 25 °C
was 53 months (less than 2 % hydrolysis within 28 days), at pH 11
hydrolysis half-life was 2.4 hours. The deceted transformation product
was 14C- methacrylic acid.
MMA, like other lower methacrylate esters, is stable at neutral and acidic pH. Under normal environmental conditions, abiotic degradation by hydrolysis is slow and not expected to play an important role in the degradation of MMA in the environment. Hydrolysis time in alkali pH 11 was 2.4 hours.
Abiotic degradation by hydrolyses of methyl methacrylate was measured in
a GLP U.S.-EPA guideline study (Archer, 1990, cited in EU-RAR 2002). The
measured half-life (t 1/2 ) for 14C-methyl methacrylate at 25 °C is 143
minutes at pH 11. Since less than 2% hydrolyses occurred for 14C-methyl
methacrylate at pH 7 over 28 days, the approximate half-life calculated
from the initial and final concentration for pH 7 was 1600 days.
14C-methyl methacrylate is stable to hydrolysis at pH 3. Nevertheless,
since methyl methacrylate is readily biodegradable, hydrolysis is not
the predominate degradation process.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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