How to choose Optical Brightening Agent?

General Guide

Here we could use optical brightener classification as a general guide which we could know if we choosing the right type of optical brightener for our application

optical brightener for detergent

including optical brightener CBS-X, DMS/AMS, CBS-155

optical brightener for paper

including Optical brightener PC, BBU/ BBU-L, VBL/VBL-L

optical brightener for fiber and textile

including optical brightener 4BK, ER-I/ER-I L, ER-II/ER-II L, EBF/EBF-L, PF / DT, BA, CXT, R4, MST-L, BAC, SWN / AW-L, WGS, NFW

optical brightener for plastic

including optical brightener OB, OBR, OB-1, KSN, KCB, KSB, FP-127, CBS-127, PF

optical brightener for paint and ink

including optical brightener UVT-1, ST, OEF, RT

Things to Know When Choosing Brightener Agent For Plastics?

1.Whitening Effect

The whitening effect is related to the substrate to whitening, processing conditions and possible interactions with other components in the formulation.

2.Responsiveness

OBAs should compatible with plastic in case of bleeding. Compared with textile, thermoplastic usage OBAs shall require higher heat resistance and lower volatility.

3.Light Resistance

Fluorescent optical brightener had a limited light resistance, much lower than pigments and most plastics. While in many cases, the photochemical degradation of fluorescent whitening agents shall not yellowing the plastics.

4.Hue

In most cases, people would prefer mid to blue to bluish green shade rather than red.

5.Processing condition

To maximize whitening effect, OBAs should completely resolve or evenly dispensed into the product.

6.Other Components

Other components in systems, such as pigments, UV absorber, titanium dioxide pigments (TiO2 ) absorb light in the same UV wavelength range as fluorescent whiteners, thus reduce OBAs whitening effect. Anatase-type titanium dioxide pigments absorb approximately 40% of the incident radiation at 380nm, while rutile type titanium dioxide pigments absorb about 90%. UV absorber absorber the light as well while whitening effectiveness is less reduced.

Typical Optical Brighteners For Plastics, Detergent

As chart below, we listed the typical plastic and detergent applied optical brightener

Application	OBAs Adding Form	Typical OBAs	Issue to mind
R-PVC	Dry powder mix	OB	Solubility Immigration resistance
F-PVC	Dissolve or disperse in Plasticizer	OB
Transparent PVC	Plasticizer+OBAs Masterbatch OBAs+PVC Masterbatch
PS	Dry powder mix before processing	OB
ABS	Dry powder mix before processing	OB
PC ＜300	Dry powder mix before processing	OB	Heat stability; volatility
PC ＞300	Dry powder mix before processing	OB-1
PU Film	Dry powder mix before process with granules or solution	Single component KCB	Immigration resistance Solubility
PU Coating	Dry powder mix before process with a solution		/
PU Adhesive	Liquid or dispersion		/
PU form	Liquid		Polyhydric alcohol soluble
Polyolefin	Dry powder mix	KP 127 KSN	Compatibility PP＞hdpe＞ldpe Immigration resistance
PMMA	Dry powder mix	OB KCB	Solubility
UPR	Dissolve FWA into UPR Before curing	OB	Solubility No side effect during curing
PET	polycondensation	OB-1	After treatment necessary
PA	Spinning	OB-1	/
Detergent Water based coating	Liquid	CBS-X	/

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