1,3-Butanediol, reaction products with 1,1'-methylenebis[4-isocyanatobenzene], propylene glycol and tripropylene glycol

Dissociation constant

Link to relevant study record(s)

Reference

Endpoint:

dissociation constant

Type of information:

other: Estimation by calculation

Adequacy of study:

key study

Study period:

Start date of the experimental work: 22 August 2014 and Completion date of the experimental work: 09 October 2014.

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Estimation by calculation

Qualifier:

no guideline followed

Principles of method if other than guideline:

Experimental techniques are available for the determination of dissociation constant of a substance. These tests are described in OECD 112. They are Titration method, Spectrophotometric method and Conductometric method. The described tests cannot to be carried out because the substance, reacts with water, hence an estimation based on a calculation has been carried out.

GLP compliance:

no

Dissociating properties:

no

Temp.:

20 °C

Remarks on result:

other: 1159 cSt (mean of 2 runs)

Temp.:

40 °C

Remarks on result:

other: 178 cSt (mean of 2 runs)

Full test results.

Run	Temp. °C	Viscometer size	Calibration constant	Time (min)	Time (secs)	Viscosity (cSt)
1	20	7	2.787	6:57	417	1162.18
2	20	7	2.787	6:55	415	1156.61
3	40	4	0.1002	29:42	1782	178.56
4	40	4	0.1002	29:24	1764	176.75

Comments.

Due to the nature of the test material, several runs were performed before consistent results were obtained at each test temperature. At 20°C a time of 324 sec, 356 sec and 311 secods were initially obtained from analysis with viscometer size 7. At 40°C a time of 1847 seconds was also obsrved from analysis with viscometer size 4.

Conclusions:

At 20°C 1159 cSt (mean of 2 runs)
At 40°C 178 cSt (mean of 2 runs)

Description of key information

Estimation method: Linear free energy relationship (LFER)

At 20°C 1159 cSt (mean of 2 runs)

At 40°C 178 cSt (mean of 2 runs)