Staples Inc. is expected to gain new customers and bolster its market dominance if Office Depot’s proposed takeover of OfficeMax goes through, according to retail analysts.

Office Depot on Wednesday unveiled a $1.2 billion bid for OfficeMax — an attempt by the smaller rivals to better compete against the Framingham chain, which is the largest office supplies chain with about 2,300 stores worldwide and 39 percent of the US market, according to IBISWorld, a market research firm.