Scotchgard
（重定向自Scotchguard）
Scotchgard is a 3M brand of products, a stain repellent and durable water repellent applied to fabric, furniture, and carpets to protect them from stains.
The original formula for Scotchgard was discovered accidentally in 1952 by 3M chemists Patsy Sherman and Samuel Smith. Sales began in 1956, and in 1973 the two chemists received a patent for the formula.