S-LEC SV

Introducing the Range of SEKISUI S-LEC SV Resins

S-LEC SV is a new resin from SEKISUI which maintains the same great characteristics as the S-LEC B resin series, but also has excellent rheological properties.S-LEC SV is a new resin from SEKISUI which maintains the same great characteristics as the S-LEC B resin series, but also has excellent rheological properties.

  • S-LEC SV is a new polyvinyl acetal based polymer with excellent rheological properties
  • S-LEC SV bonds strongly to metals and inorganic materials like glass and ceramics
  • S-LEC SV is remarkably tough and flexible

 Features

<Rheological Properties>

In general, polymer/solvent solutions exhibit elongational or honey-like stringing properties caused by polymer chain entanglement.
This stringing phenomenon causes processing and quality problems in production.
S-LEC SV is a resin specially formulated to prevent stringing.

Comparison data for S-LEC SV and PVB solutions are shown in Fig. 1.
Conventional PVB solution strings readily, while S-LEC SV has low stringing properties which vastly improve processibility.

Stringing comparison

*Time required for liquid string of resin/solvent solution to break
Measurement Conditions:
Solvent: Dihydroterpinyl Acetate
Solution Viscosity: 3.5 Pa･s


Solubility

S-LEC SV is soluble in many organic solvents (alcohols, esters, ketones and terpineols).


Table1: Solubility of S-LEC SV

SOLVENT SV-12 SV-22 SV-16 SV-26

Ethanol

 S S S S

Ethil acetate

 S S S S

Metyl ethyl ketone(MEK)

 S S S S

Tolene

 IS IS IS IS

Terpineol

 S S S S

Dihydroterpineol Acetate(DHTA)

 S S S S

Butyl Carbitol Acetate(BCA)

 S S S S

Key: (S)Soluble, (PS)Partially Soluble, (IS)Insoluble
Test Method: Resins (1 g) were dissolved in solvent (20g) at 20'C

S-LEC SV Types and General Characteristics

Grade Molecular weight
(×104) 		Volatiles
(%) 		Hydroxyl content
(mol%) 		Viscosity
(mPa・S) 		Tg
 (℃)
SV-12 *1 Approx.3 3 max Approx.22 70 76
SV-22 *1 Approx.3 3 max Approx.22 100 67
SV-16 *2 Approx.10 3 max Approx.22 80 80
SV-26 *2 Approx.10 3 max Approx.22 100 71

Notes:
Ethanol:Toluene (1:1), *1: 10 wt% solution, *2: 5 wt% solution
All values measured by rotational viscometer at 20'C
All values shown are not specification limits