Final answer:
Polybutadiene rubber is the polymer used to make car tires due to its high wear resistance and is responsible for approximately 70% of its production use.
Step-by-step explanation:
The polymer used to make car tires is polybutadiene rubber, which is a synthetic rubber made from the polymerization of the monomer 1,3-butadiene. Polybutadiene rubber has a high resistance to wear, which makes it particularly suitable for the manufacturing of car tires. About 70% of polybutadiene production is used for this purpose. Additionally, it is used to enhance the toughness of other plastics like polystyrene and ABS. Synthetic rubbers have been a crucial part of various applications since the early 20th century, and polybutadiene is an excellent example of this.