Category A
What type of chemicals were experimented with during the process?
Acrylate family chemical
Who invented the Post-it note?
Two employees at 3M company
What was Art Fry's profession?
An engineer
Who was Dr. Spencer Silver?
A 3M scientist
Who were the main users of Post-it note?
Students, office workers, housewives, U.S. Post Office
What was the key factor in perfecting the post it note?
Finding the appropriate adhesive
How did Art Fry mark his favorite church hymn?
He put pieces of paper between the pages
What did Art Fry think about the "sticky bookmark"?
It could be useful
How did the adhesive coating look like when sprayed with microsphere?
A basketball's surface
When was the Post-it note launched?
1977
How did the employees improve on the basic design of the Post-it note?
Through luck and ingenuity
What problem did Fry face with his paper bookmarks?
They would fall out of the hymnal
Why does normal packing tape stick permanently?
It has a flat surface
What is the main idea of paragraph 1?
The invention of Post-it note
Why was Post-it note not successful?
Customers didn't understand how to use it
What was unique about Dr. Silver's adhesive?
It could stick to surfaces like glue but didn't leave residue
How did Art Fry think of idea of the Post-it note?
He was trying to mark the pages of a hymnbook.
Why was Silver's adhesive too weak?
It wasn't stick for a long time
What problem did the sticky bulletin board face?
Dust and dirt buildup
What are acrylate polymers commonly used in?
Paints, plastics, and textiles
How did the Post-it note finally become successful?
They gave out free sample for people to try
What made a Post-it note stick onto a page and can be easily removed and stuck somewhere else later?
The microsphere particles in the adhesive coating
What created the perfect pressure-sensitive adhesive?
Microsphere
What did customers develop as an alternative Post-it note?
a sticky bulletin board
What is microsphere?
Tiny round molecules