2-Propenoic acid, 2-methyl-, C6-12-alkyl esters

Melting point / freezing point

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

No data regarding GLP.

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

GLP compliance:

not specified

Type of method:

other: melted microscopy

Melting / freezing pt.:

< -50 °C

Conclusions:

In a valid guideline study the melting point is <-50 C.

Executive summary:

In a valid guideline study the melting point is <-50 C.

NOTE: Any of data in this dataset are disseminated by the European Union on a right-to-know basis and this is not a publication in the same sense as a book or an article in a journal. The right of ownership in any part of this information is reserved by the data owner(s). The use of this information for any other, e.g. commercial purpose is strictly reserved to the data owners and those persons or legal entities having paid the respective access fee for the intended purpose.

Reference 2

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

OECD 102, non GLP. Study performed and documented equivalent to GLP standards. Study according to relevant guideline.

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

(adopted 27 July 1995)

Deviations:

no

Principles of method if other than guideline:

In a measurement with differential scanning calorimetry (DSC) a sample of the test item and a reference material (identical crucible without the test
item) are subjected to the same controlled temperature program. The difference in the temperatures of the test item and the reference material is the original measurement signal which is internally assigned to the heat flow rate. The heat flux DSC belongs to the class of heat-exchanging
calorimeters. A defined exchange of the heat to be measured takes place via a thermal resistance. In contrast in the power compensation DSC, the
heat to be measured is compensated with electric energy, by increasing or decreasing an adjustable heating power.
When the sample undergoes a transition involving a change in enthalpy, for example an endothermic melting or boiling transition, that change is
indicated by a departure from the base line of the heat flow record. The peak area is proportional to the change in enthalpy.

GLP compliance:

no

Remarks:

Study performed and documented equivalent to GLP standards.

Type of method:

other: Differential Scanning Calorimetry

Melting / freezing pt.:

-116 °C

Atm. press.:

1 018 hPa

Remarks on result:

other: glass transition temperature; No melting point was detected.

The melting temperature of the test item was determined by differential scanning calorimetry according to EN ISO 11357-3 (Plastics-Differential scanning Calorimetry- Part 3 Determination of Temperature and enthalpy of melting and crystallization) and EEC-Directive 92/69 EEC, Part A.2 (Methods for the determination of physico-chemical properties, A. 1 „Melting temperature“, EEC

Publication No. L383, December 1992).

Melting Point : No melting point was detected.

Conclusions:

The melting temperature of the test item was determined by differential scanning calorimetry according to EN ISO 11357-3 (Plastics-Differential scanning Calorimetry- Part 3 Determination of Temperature and enthalpy of melting and crystallization) and EEC-Directive 92/69 EEC, Part A.2
(Methods for the determination of physico-chemical properties, A. 1 „Melting temperature“, EEC Publication No. L383, December 1992).
Melting Point : No melting point was detected.
The glass transition temperature was -116 °C at 1018 hPa

Executive summary:

The melting temperature of the test item was determined by differential scanning calorimetry according to EN ISO 11357-3 (Plastics-Differential scanning Calorimetry- Part 3 Determination of Temperature and enthalpy of melting and crystallization) and EEC-Directive 92/69 EEC, Part A.2 (Methods for the determination of physico-chemical properties, A. 1 „Melting temperature“, EEC Publication No. L383, December 1992).

Melting Point : No melting point was detected.

The glass transition temperature was -116 °C at 1018 hPa

NOTE: Any of data in this dataset are disseminated by the European Union on a right-to-know basis and this is not a publication in the same sense as a book or an article in a journal. The right of ownership in any part of this information is reserved by the data owner(s). The use of this information for any other, e.g. commercial purpose is strictly reserved to the data owners and those persons or legal entities having paid the respective access fee for the intended purpose.

Reference 3

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Qualifier:

according to guideline

Guideline:

other: not known

Principles of method if other than guideline:

other: no data

GLP compliance:

not specified

Type of method:

other: no data

Melting / freezing pt.:

-7 °C

Atm. press.:

1 013 hPa

Remarks on result:

other: atmospheric pressure (1013 hPa) assumed

Conclusions:

A reliable handbook value for the melting point is reported to be - 7 °C at a assumed atmospheric pressure of 1013 hPa.

Executive summary:

A reliable handbook value for the melting point is reported to be - 7 °C at a assumed atmospheric pressure of 1013 hPa.

Description of key information

Read across to the individual substances n-Nonyl methacrylate, i-Nonyl methacrylate, n-Decyl methacrylate (n-DMA), i-Decyl methacrylate (i-DMA), n-Lauryl methacrylate (n-LMA) and n-Tetradecyl methacrylate (n-TDMA) of NUMA UVCB substance and structural analogue substances of NUMA 2 -Ethylhexyl methacrylate (2 -EHMA) and LIMA UVCB substance (C12 -C16 methacrylate, CAS: 90552 -02 -6):

The melting temperature of the structural analogue 2-Ethylhexyl methacrylate showed a melting point below -50°C (experimental result according to OECD 102).

For iso-decyl methacrylate no melting point was determined, glass transition temperature: -116 °C (experimental result according to OECD 102, the melting point could not be determined).

For n-dodecyl methacrylate (only an impurity of NUMA UVCB substance) a melting point of -7°C was published. (Brandes E., Möller W. (2003), Narbert, Schön (2004)).

The physicochemical properties of the constituents of NUMA are showing a regular pattern. With increasing chain length, the melting points increase. Therefore it can be anticipated that the melting point of NUMA UVCB substance is < -7 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

-7 °C

Additional information

The melting temperature of the structural analogue 2-Ethylhexyl methacrylate showed a melting point below - 50 °C. For n-Decyl methacrylate, a transition temperature of - 116 °C was experimentally determined and for n-dodecyl methacrylate a melting point of -7 °C was published. Therefore a melting point below -7 °C can be anticipated for NUMA UVCB substance as worst case..