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EC number: 266-040-8
CAS number: 65997-04-8
The Rosin adducts and rosin adduct salts category is a UVCB category and
includes rosin or rosin salts that have been chemically reacted with
either fumaric acid or maleic anhydride. Rosin acids are the predominant
components of rosin (>85%). Rosin acids are composed of three skeletal
classes of tricyclic carboxylic acids which share similar structures,
but vary in the position of the double bonds and methyl groups. As each
member of this category is a UVCB, the organic components will vary in
type and proportion. The presence of a metal cation will not alter the
structure of the organic component of the molecule. The organic
component can therefore be viewed as similar across the category.
The available ecotoxicity results indicate that there may be differences
in environmental toxicity between substances reacted with fumaric acid
and substances reacted with maleic anhydride, although the reasons for
this are not clear. Therefore, although maleated and fumarated
substances are structurally similar and it is appropriate for these
substances to be considered within a single category, for ecotoxicity
endpoints read across is not conducted between fumarated and maleated
One fumarated rosin substance is being registered within the Rosin
adducts category (rosin, fumarated) and another substance falls within
the category definition and has data available, but is no longer being
registered under REACH (rosin, fumarated, reaction products with
formaldehyde). Both substances are structurally similar and a comparison
of the available acute ecotoxicity data (acute Daphnia and fish) also
shows that these substances demonstrate similar toxicity.
The ecotoxicity of maleated substances is affected by the solubility of
the test item, with more soluble substances rosin, maleated and resin
acids and rosin acids, maleated sodium salts showing higher aquatic
toxicity compared to the poorly soluble substance resin acids and rosin
acids, maleated calcium salts.
Rosin, mealeated and resin acids and rosin acids, maleated, sodium salts
are both partially soluble and for these substances EC50 values of 9.3
and 4.8 mg/L, respectively, were determined for the most sensitive
Resin acids and rosin acids, maleated, calcium salts is poorly soluble and
for this substance the EL50 values determined in aquatic toxicity
studies were all above the highest loading rate tested. This
difference in solubility between monovalent salts of rosin substances,
such as the maleated sodium salt and divalent salts such as the maleated
calcium salt, is also observed for rosin salts. Due to its low
solubility, no effects at the limit of solubility were observed for
resin acids and rosin acids, maleated calcium salts in acute ecotoxicity
studies with test solutions prepared as Water Accommodated Fractions.
As a full base set of acute ecotoxicity data is available for resin
acids and rosin acids, maleated, calcium salts and the EL50 values in
all studies were determined to be greater than the limit of solubility,
it is most appropriate to use the data for the substance itself in order
to complete REACH ecotoxicity endpoints and to classify the substance.
For PNEC derivation purposes, however, a single set of PNECs is derived
to cover all maleated rosin substances, based on the most sensitive
result for any maleated rosin substance. The PNECs are therefore derived
based on the acute fish LC50 for the soluble maleated rosin substance
resin acids and rosin acids, sodium salts. This is considered to be a
worst-case approach for PNEC derivation.
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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