What are the rubber components of shoe soles?

What are the rubber components of the shoe sole? 1. Ordinary rubber sole (RB):
RB is the abbreviation for rubber; it is formed by hot pressing and can be divided into natural rubber and regenerated rubber. It is heavy, not oil-resistant, and must be roughened on the bonding surface during molding. It is prone to shrinkage when heated, and the color is inconsistent.
Advantages: Good wear resistance, anti-slip, elastic, not easy to break, good softness, good extensibility, stable shrinkage, good hardness, good flexibility, waterproof.
Disadvantages: Heavier, prone to frosting (quality issue), not easy to corrode (environmental issue); not hard, easily penetrated; poor breathability and moisture absorption, afraid of oil immersion, not suitable for wearing in places like gas stations where it comes into contact with oil.
2. High-pressure polyethylene rubber sole
Sole made of high-pressure polyethylene and rubber as the main components, using both rubber and plastic.
Raw rubber sole: heavy, relatively expensive, not oil-resistant, not heat-resistant. Prone to discoloration.
3. SBR sole:
Styrene-butadiene rubber (SBR) is a polymer elastomer material synthesized from butadiene and styrene as the main monomers through copolymerization, with uniform and pure quality and few impurities. It can dissolve in organic solvents such as benzene, toluene, gasoline, and chloroform. The unsaturated double bonds in the SBR molecules form a cross-linked network structure with vulcanizing agents through substitution or addition reactions. The SBR vulcanizate reinforced with reinforcing agents has high physical and mechanical properties.
SBR has a slow vulcanization speed, but good vulcanization flatness, not easy to over-vulcanize, and has excellent properties such as aging resistance, heat resistance, and wear resistance.
The raw materials for these three types: (1) Chloroprene rubber: also known as chloroprene rubber. A type of synthetic rubber. It is the α-polymer of chloroprene. Soluble in solvents such as benzene and chloroform. It swells slightly but does not dissolve in mineral oil and vegetable oil. Used to manufacture rubber products such as conveyor belts, hoses, and cables, and can also be used as coatings and adhesives. Used as a bonding agent in this formulation. Selected industrial products.
(2) Methyl methacrylate: a colorless, easily volatile liquid. Slightly soluble in water, soluble in various organic solvents. It easily polymerizes in the presence of light, heat, ionizing radiation, and catalysts. Used to manufacture organic glass, resins, plastics, coatings, adhesives, lubricants, etc. Used as a bonding agent and modifier in this formulation. Selected industrial products.
(3) Benzoyl peroxide: referred to as BPO. A white crystalline powder, slightly soluble in water and ethanol, soluble in organic solvents such as benzene and chloroform. It is used as an initiator for polymerization reactions of olefin units (such as vinyl chloride, acrylonitrile) and photochemical reactions. It can spontaneously explode when heated or subjected to friction, and contact with flammable materials can cause fires, so it must be stored in a cool, dark place and fire precautions should be taken.
(4) Toluene: a colorless, easily volatile liquid. It has an aromatic odor. Insoluble in water, soluble in ethanol, ether, and acetone. Its chemical properties are similar to those of benzene. Used to manufacture saccharin, dyes, drugs, explosives, etc. Used as a solvent in this formulation. Selected industrial products.
(5) Cyclohexanone: a colorless oily liquid. It has an odor similar to acetone. Slightly soluble in water, more easily soluble in ethanol and ether. Used to manufacture resins, synthetic fibers, etc. Used as a diluent in this formulation.
(6) Phenolic resin: formed by the polycondensation of phenols and aldehydes. Usually obtained from the reaction of phenol and formaldehyde, resulting in liquid and solid products. Phenolic resins are resistant to acids, alkalis, and heat. Used to prepare coatings, adhesives, phenolic plastics, etc. Due to differences in variety, composition, and performance, phenolic resins can be divided into pure phenolic resins, modified phenolic resins, and phenol-formaldehyde resins. The formulation uses pure phenolic resin as a bonding agent.
(7) Rosin resin: also known as coumarone resin, is a resin formed by the polymerization of coal tar fractions at 160-185°C (mainly containing coumarone and indene). It ranges from light yellow to black. It is resistant to acids and alkalis. Insoluble in low molecular weight monohydric alcohols and polyols, soluble in chlorinated hydrocarbons, esters, ethers, ketones, nitrobenzene, and aniline. Mainly used to replace natural resins or esterified rosin to formulate insulating coatings and anti-rust coatings. It is also used as a softening agent for rubber and an adhesive for ceramics.