How to Use	Performance Features
Type A	Methyl group	Main agent, resin hybridizer	High hardness, water repellency, curing properties
	Methyl group, Phenyl group		High gloss, compatibility, crack and peel resistance
Type AR	Epoxy group	Coupling agent between organic resin and inorganic material	Adhesion improvement
	Mercapto Group		Adhesion improvement
	Acryl groups		Adhesion improvement
	Methacrylic group		Adhesion improvement
	Vinyl groups		Flame retardancy improvement
Type R	Alicyclic epoxy group	Primary agent and hybridizer for epoxy and acrylic compositions	Low cure shrinkage, heat resistance
	Acrylic group		Flexible, crack resistance

Products when used as a Coating Agents

This section introduces the general physical properties of each product, the hardness of the cured film, the positioning of crack resistance, and the differences in curing speed.

Product List

Product name/Item	Functional Groups	Alkoxy Group	Viscosity at 25°C mm2/s	Features
KC-89S	Methyl	Methoxy	5	High hardness, low degree of polymerization
KR-515	Methyl		7	High hardness, higher molecular weight than KC-89S
KR-500	Methyl		25	High hardness, medium weight
X-40-9225	Methyl		100	Medium hardness, high degree of polymerization
X-40-9246	Methyl		80	Flexible
X-40-9250	Methyl		80	Flexible, water repellent
KR-401N	Methyl/Phenyl		20	Low phenyl content, medium hardness
X-40-9227	Methyl/Phenyl		15	Low phenyl content, better flexibility than KR-510
KR-510	Methyl/Phenyl		100	Contains medium phenyl, flexible
KR-213	Methyl/Phenyl		16	High phenyl content, flexible
X-40-9312 (Development product)	Methyl/Phenyl		250	High hardness, crack resistance
X-40-9300 (Development product)	Not disclosed		70	Fast curing, alkali resistance, water resistance
X-40-9301 (Development product)	Not disclosed		12	Alkali resistance, water resistance
X-88-1004 (Development product)	Methyl		3.5	High hardness, excellent adhesiveness
X-88-1007 (Development product)	Methyl		19	Excellent water repellency and adhesiveness
X-48-1500 (Development product)	Methyl		50	High hardness, flex resistance
X-48-1600 (Development product)	Methyl	Ethoxy	15	Flexible, deethanolated

(Not specified values)

Hardness and Crack Resistance Positioning (at Room Temperature Curing)

Cure Speed

One-component (Containing Curing Catalyst) Type

One-component curing type products are also available, in which type A oligomers contain a curing catalyst. KR-400 is designed for high hardness, KR-401 for crack resistance, X-40-2327 for fast curing, KR-4000G for water repellency, water sliding property, and high gloss, and KR-4000F2 for water and oil repellency.

Silicone Oligomer based Coating Agent

A one-component coating agent containing a curing catalyst. It is used as a water repellent for treating inorganic materials because its excellent water repellency and water sliding properties prevent staining.

Main Products

Product Name/Item	Organic Functional Groups	Viscosity at 25°C (mm2/s)	Tack free at 25°C (min)	Contact angle 2μL °	Water sliding angle 20μL °	Features
KR-400	Methyl	1.2	30 to 60	92	32	Formulation of a high hardness film
X-40-2327∗	Methyl	0.9	5 to 10	93	67	Fast curing
KR-401	Methyl/Phenyl	20	30 to 60	84	51	Excellent resistance to cracking and bending
KR-4000G	Methyl	5 to 10	60	101	25	Excellent water-sliding properties and gloss

(Not specified values)

∗ Base material:

Polished steel plate, film thickness=10μm, 25°C/70%RH curing (tack-free time varies with temperature and humidity)

∗ Acid component in the product.

 

Application Examples

Stain-resistant coatings

Water Contact Angle and Water Sliding Angle

Silicone Oligomer based Coatings

Due to its excellent water repellent/oil repellent properties, it is resistant to oil stains and can be used as a raw material for coatings that easily remove oil stains with a light wipe. Even when wiped up with a cloth before curing to make a thinner film, it still exhibits water repellency and oil repellency. In addition, although it is a fluorinated product, it can be diluted with common organic solvents.

Development Products

Product Name	Tack-free Time min at 25℃	Pencil Hardness/Curing Days	Hexadecane Contact Angle 2μL°	Water Contact Angle 2μL°	Water Sliding Angle 2μL°
KR-4000F2	30	F/2→H/7	65	111	16

(Not specified values)

Compatibility with Organic Solvents

Product Name	Diluted in Toluene 50wt%	Isoparaffin Dilution 50wt%
KR-4000F2	Compatible	Compatible
Conventional fluorinated coating agent (Shin-Etsu product)	Separation	Separation

Stain Prevention Test with Oil-based Marker

∗ Film formed on glass with Bar Coater No.3, cured for 24h at room temperature

Product when used as a Resin Hybridizer

The silanol groups generated by the hydrolysis of alkoxysilyl or alkoxysilyl groups can be used to modify other organic resins to improve their heat resistance and weather resistance. The reaction mechanism involves “de-alcohol condensation” of the alcoholic hydroxyl groups and alkoxysilyl groups in each organic resin, and “dehydration condensation” of the silanol groups. Water-based organic resins include the methyl group. For solvent-based organic resins, phenyl oligomers are generally used.

Reaction Mechanism

Features of each Organic Resin Modified with Silicone

• Acrylic Resins

  In addition to the inherent solvent resistance, chemical resistance, and durability of acrylic resins, these resins can also provide weatherability and heat resistance, making them widely used as coating resins for building materials.

• Epoxy Resins

  In addition to the inherent anticorrosive properties of epoxy resins, they can also provide weather and heat resistance, and are therefore often used in coatings to protect against aggressive substances.

• Polyester Resin

  In addition to the inherent bending resistance of polyester resin, it can also provide weather and heat resistance, making it suitable for use in paints for construction materials, general industry, and home appliances used at high temperatures.

• Alkyd resin

  Because alkyd resin can be given weather resistance, it is used as a room temperature curing paint resin for tanks, ships, bridges, etc. where weather resistance is required.

Main Products

KR-510

Alkoxy Oligomers Containing Methyl/Phenyl Groups

KR-510 is a methyl/phenyl silicone oligomer containing methoxy groups. Because it contains phenyl groups, it has excellent compatibility with organic resins. By mixing with or demethanol reacting with organic resins that have reactive groups with methoxysilyl groups, it can impart heat resistance, weather resistance, and chemical resistance to resins, and can also be used as a reactive diluent.

Application Examples

By incorporating the siloxane backbone of silicone oligomers into polyester resins, weather resistance can be improved.

Modification of Polyester Resin by Silicone Oligomers

Results of Weatherability Evaluation of Silicone Modified Polyester Resin

General Properties

Item/Product Name	KR-510
Appearance	Colorless transparent liquid
Viscosity at 25°C (mm2/s)	100
Specific gravity at 25°C	1.16
Refractive Index at 25°C	1.509
Amount of methoxy groups (wt%)	17
Active ingredient (%)	100

(Not specified values)

Coating Film Properties

Item/Curing Conditions	285°C×1min	285°C×10min
Pencil hardness	2H	4H
Adhesion (cross cut adhesion test)	100/100	100/100
Impact resistance Dupont style (cm)	50 or more	50 or more
MEK∗ rubbing frequency	100	100 or more
Xylene rubbing frequency	10	100 or more

(Not specified values)

∗MEK:

Methyl ethyl ketone

KR-500

Methyl group-containing alkoxy oligomers

KR-500 is a methyl silicone oligomer with methoxy groups. By mixing it with organic resins having reactive groups with methoxysilyl groups or by demethanol reaction, it can add heat resistance, weather resistance, and chemical resistance to resins. It can also be applied to water-based resins.

Application Examples

Modified by dehydration and de-alcohol condensation, they can impart weather resistance in addition to adhesion to materials.

Modification Method for Acrylic Emulsions using Silicone Oligomers

Resin Modification Model

General Properties

Item/Product Name	KR-500
Features	Medium polymeric materials
Appearance	Colorless transparent to pale yellow slightly cloudy liquid
Viscosity at 25°C (mm2/s)	25
Specific gravity at 25°C	1.15
Refractive Index at 25°C	1.403
Amount of methoxy groups (wt%)	28
Active ingredient (%)	100

(Not specified values)